+++ /dev/null
-/**************************************************************************
- *
- * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
- * All Rights Reserved.
- * Copyright 2008 VMware, Inc. All rights reserved.
- *
- * Permission is hereby granted, free of charge, to any person obtaining a
- * copy of this software and associated documentation files (the
- * "Software"), to deal in the Software without restriction, including
- * without limitation the rights to use, copy, modify, merge, publish,
- * distribute, sub license, and/or sell copies of the Software, and to
- * permit persons to whom the Software is furnished to do so, subject to
- * the following conditions:
- *
- * The above copyright notice and this permission notice (including the
- * next paragraph) shall be included in all copies or substantial portions
- * of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
- * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
- * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
- * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
- * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
- * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
- *
- **************************************************************************/
-
-/**
- * Texture sampling
- *
- * Authors:
- * Brian Paul
- */
-
-#include "lp_context.h"
-#include "lp_quad.h"
-#include "lp_texture.h"
-#include "lp_tex_sample.h"
-#include "lp_tex_cache.h"
-#include "pipe/p_context.h"
-#include "pipe/p_defines.h"
-#include "pipe/p_shader_tokens.h"
-#include "util/u_math.h"
-#include "util/u_memory.h"
-
-
-
-/*
- * Note, the FRAC macro has to work perfectly. Otherwise you'll sometimes
- * see 1-pixel bands of improperly weighted linear-filtered textures.
- * The tests/texwrap.c demo is a good test.
- * Also note, FRAC(x) doesn't truly return the fractional part of x for x < 0.
- * Instead, if x < 0 then FRAC(x) = 1 - true_frac(x).
- */
-#define FRAC(f) ((f) - util_ifloor(f))
-
-
-/**
- * Linear interpolation macro
- */
-static INLINE float
-lerp(float a, float v0, float v1)
-{
- return v0 + a * (v1 - v0);
-}
-
-
-/**
- * Do 2D/biliner interpolation of float values.
- * v00, v10, v01 and v11 are typically four texture samples in a square/box.
- * a and b are the horizontal and vertical interpolants.
- * It's important that this function is inlined when compiled with
- * optimization! If we find that's not true on some systems, convert
- * to a macro.
- */
-static INLINE float
-lerp_2d(float a, float b,
- float v00, float v10, float v01, float v11)
-{
- const float temp0 = lerp(a, v00, v10);
- const float temp1 = lerp(a, v01, v11);
- return lerp(b, temp0, temp1);
-}
-
-
-/**
- * As above, but 3D interpolation of 8 values.
- */
-static INLINE float
-lerp_3d(float a, float b, float c,
- float v000, float v100, float v010, float v110,
- float v001, float v101, float v011, float v111)
-{
- const float temp0 = lerp_2d(a, b, v000, v100, v010, v110);
- const float temp1 = lerp_2d(a, b, v001, v101, v011, v111);
- return lerp(c, temp0, temp1);
-}
-
-
-
-/**
- * If A is a signed integer, A % B doesn't give the right value for A < 0
- * (in terms of texture repeat). Just casting to unsigned fixes that.
- */
-#define REMAINDER(A, B) ((unsigned) (A) % (unsigned) (B))
-
-
-/**
- * Apply texture coord wrapping mode and return integer texture indexes
- * for a vector of four texcoords (S or T or P).
- * \param wrapMode PIPE_TEX_WRAP_x
- * \param s the incoming texcoords
- * \param size the texture image size
- * \param icoord returns the integer texcoords
- * \return integer texture index
- */
-static INLINE void
-nearest_texcoord_4(unsigned wrapMode, const float s[4], unsigned size,
- int icoord[4])
-{
- uint ch;
- switch (wrapMode) {
- case PIPE_TEX_WRAP_REPEAT:
- /* s limited to [0,1) */
- /* i limited to [0,size-1] */
- for (ch = 0; ch < 4; ch++) {
- int i = util_ifloor(s[ch] * size);
- icoord[ch] = REMAINDER(i, size);
- }
- return;
- case PIPE_TEX_WRAP_CLAMP:
- /* s limited to [0,1] */
- /* i limited to [0,size-1] */
- for (ch = 0; ch < 4; ch++) {
- if (s[ch] <= 0.0F)
- icoord[ch] = 0;
- else if (s[ch] >= 1.0F)
- icoord[ch] = size - 1;
- else
- icoord[ch] = util_ifloor(s[ch] * size);
- }
- return;
- case PIPE_TEX_WRAP_CLAMP_TO_EDGE:
- {
- /* s limited to [min,max] */
- /* i limited to [0, size-1] */
- const float min = 1.0F / (2.0F * size);
- const float max = 1.0F - min;
- for (ch = 0; ch < 4; ch++) {
- if (s[ch] < min)
- icoord[ch] = 0;
- else if (s[ch] > max)
- icoord[ch] = size - 1;
- else
- icoord[ch] = util_ifloor(s[ch] * size);
- }
- }
- return;
- case PIPE_TEX_WRAP_CLAMP_TO_BORDER:
- {
- /* s limited to [min,max] */
- /* i limited to [-1, size] */
- const float min = -1.0F / (2.0F * size);
- const float max = 1.0F - min;
- for (ch = 0; ch < 4; ch++) {
- if (s[ch] <= min)
- icoord[ch] = -1;
- else if (s[ch] >= max)
- icoord[ch] = size;
- else
- icoord[ch] = util_ifloor(s[ch] * size);
- }
- }
- return;
- case PIPE_TEX_WRAP_MIRROR_REPEAT:
- {
- const float min = 1.0F / (2.0F * size);
- const float max = 1.0F - min;
- for (ch = 0; ch < 4; ch++) {
- const int flr = util_ifloor(s[ch]);
- float u;
- if (flr & 1)
- u = 1.0F - (s[ch] - (float) flr);
- else
- u = s[ch] - (float) flr;
- if (u < min)
- icoord[ch] = 0;
- else if (u > max)
- icoord[ch] = size - 1;
- else
- icoord[ch] = util_ifloor(u * size);
- }
- }
- return;
- case PIPE_TEX_WRAP_MIRROR_CLAMP:
- for (ch = 0; ch < 4; ch++) {
- /* s limited to [0,1] */
- /* i limited to [0,size-1] */
- const float u = fabsf(s[ch]);
- if (u <= 0.0F)
- icoord[ch] = 0;
- else if (u >= 1.0F)
- icoord[ch] = size - 1;
- else
- icoord[ch] = util_ifloor(u * size);
- }
- return;
- case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_EDGE:
- {
- /* s limited to [min,max] */
- /* i limited to [0, size-1] */
- const float min = 1.0F / (2.0F * size);
- const float max = 1.0F - min;
- for (ch = 0; ch < 4; ch++) {
- const float u = fabsf(s[ch]);
- if (u < min)
- icoord[ch] = 0;
- else if (u > max)
- icoord[ch] = size - 1;
- else
- icoord[ch] = util_ifloor(u * size);
- }
- }
- return;
- case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_BORDER:
- {
- /* s limited to [min,max] */
- /* i limited to [0, size-1] */
- const float min = -1.0F / (2.0F * size);
- const float max = 1.0F - min;
- for (ch = 0; ch < 4; ch++) {
- const float u = fabsf(s[ch]);
- if (u < min)
- icoord[ch] = -1;
- else if (u > max)
- icoord[ch] = size;
- else
- icoord[ch] = util_ifloor(u * size);
- }
- }
- return;
- default:
- assert(0);
- }
-}
-
-
-/**
- * Used to compute texel locations for linear sampling for four texcoords.
- * \param wrapMode PIPE_TEX_WRAP_x
- * \param s the texcoords
- * \param size the texture image size
- * \param icoord0 returns first texture indexes
- * \param icoord1 returns second texture indexes (usually icoord0 + 1)
- * \param w returns blend factor/weight between texture indexes
- * \param icoord returns the computed integer texture coords
- */
-static INLINE void
-linear_texcoord_4(unsigned wrapMode, const float s[4], unsigned size,
- int icoord0[4], int icoord1[4], float w[4])
-{
- uint ch;
-
- switch (wrapMode) {
- case PIPE_TEX_WRAP_REPEAT:
- for (ch = 0; ch < 4; ch++) {
- float u = s[ch] * size - 0.5F;
- icoord0[ch] = REMAINDER(util_ifloor(u), size);
- icoord1[ch] = REMAINDER(icoord0[ch] + 1, size);
- w[ch] = FRAC(u);
- }
- break;;
- case PIPE_TEX_WRAP_CLAMP:
- for (ch = 0; ch < 4; ch++) {
- float u = CLAMP(s[ch], 0.0F, 1.0F);
- u = u * size - 0.5f;
- icoord0[ch] = util_ifloor(u);
- icoord1[ch] = icoord0[ch] + 1;
- w[ch] = FRAC(u);
- }
- break;;
- case PIPE_TEX_WRAP_CLAMP_TO_EDGE:
- for (ch = 0; ch < 4; ch++) {
- float u = CLAMP(s[ch], 0.0F, 1.0F);
- u = u * size - 0.5f;
- icoord0[ch] = util_ifloor(u);
- icoord1[ch] = icoord0[ch] + 1;
- if (icoord0[ch] < 0)
- icoord0[ch] = 0;
- if (icoord1[ch] >= (int) size)
- icoord1[ch] = size - 1;
- w[ch] = FRAC(u);
- }
- break;;
- case PIPE_TEX_WRAP_CLAMP_TO_BORDER:
- {
- const float min = -1.0F / (2.0F * size);
- const float max = 1.0F - min;
- for (ch = 0; ch < 4; ch++) {
- float u = CLAMP(s[ch], min, max);
- u = u * size - 0.5f;
- icoord0[ch] = util_ifloor(u);
- icoord1[ch] = icoord0[ch] + 1;
- w[ch] = FRAC(u);
- }
- }
- break;;
- case PIPE_TEX_WRAP_MIRROR_REPEAT:
- for (ch = 0; ch < 4; ch++) {
- const int flr = util_ifloor(s[ch]);
- float u;
- if (flr & 1)
- u = 1.0F - (s[ch] - (float) flr);
- else
- u = s[ch] - (float) flr;
- u = u * size - 0.5F;
- icoord0[ch] = util_ifloor(u);
- icoord1[ch] = icoord0[ch] + 1;
- if (icoord0[ch] < 0)
- icoord0[ch] = 0;
- if (icoord1[ch] >= (int) size)
- icoord1[ch] = size - 1;
- w[ch] = FRAC(u);
- }
- break;;
- case PIPE_TEX_WRAP_MIRROR_CLAMP:
- for (ch = 0; ch < 4; ch++) {
- float u = fabsf(s[ch]);
- if (u >= 1.0F)
- u = (float) size;
- else
- u *= size;
- u -= 0.5F;
- icoord0[ch] = util_ifloor(u);
- icoord1[ch] = icoord0[ch] + 1;
- w[ch] = FRAC(u);
- }
- break;;
- case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_EDGE:
- for (ch = 0; ch < 4; ch++) {
- float u = fabsf(s[ch]);
- if (u >= 1.0F)
- u = (float) size;
- else
- u *= size;
- u -= 0.5F;
- icoord0[ch] = util_ifloor(u);
- icoord1[ch] = icoord0[ch] + 1;
- if (icoord0[ch] < 0)
- icoord0[ch] = 0;
- if (icoord1[ch] >= (int) size)
- icoord1[ch] = size - 1;
- w[ch] = FRAC(u);
- }
- break;;
- case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_BORDER:
- {
- const float min = -1.0F / (2.0F * size);
- const float max = 1.0F - min;
- for (ch = 0; ch < 4; ch++) {
- float u = fabsf(s[ch]);
- if (u <= min)
- u = min * size;
- else if (u >= max)
- u = max * size;
- else
- u *= size;
- u -= 0.5F;
- icoord0[ch] = util_ifloor(u);
- icoord1[ch] = icoord0[ch] + 1;
- w[ch] = FRAC(u);
- }
- }
- break;;
- default:
- assert(0);
- }
-}
-
-
-/**
- * For RECT textures / unnormalized texcoords
- * Only a subset of wrap modes supported.
- */
-static INLINE void
-nearest_texcoord_unnorm_4(unsigned wrapMode, const float s[4], unsigned size,
- int icoord[4])
-{
- uint ch;
- switch (wrapMode) {
- case PIPE_TEX_WRAP_CLAMP:
- for (ch = 0; ch < 4; ch++) {
- int i = util_ifloor(s[ch]);
- icoord[ch]= CLAMP(i, 0, (int) size-1);
- }
- return;
- case PIPE_TEX_WRAP_CLAMP_TO_EDGE:
- /* fall-through */
- case PIPE_TEX_WRAP_CLAMP_TO_BORDER:
- for (ch = 0; ch < 4; ch++) {
- icoord[ch]= util_ifloor( CLAMP(s[ch], 0.5F, (float) size - 0.5F) );
- }
- return;
- default:
- assert(0);
- }
-}
-
-
-/**
- * For RECT textures / unnormalized texcoords.
- * Only a subset of wrap modes supported.
- */
-static INLINE void
-linear_texcoord_unnorm_4(unsigned wrapMode, const float s[4], unsigned size,
- int icoord0[4], int icoord1[4], float w[4])
-{
- uint ch;
- switch (wrapMode) {
- case PIPE_TEX_WRAP_CLAMP:
- for (ch = 0; ch < 4; ch++) {
- /* Not exactly what the spec says, but it matches NVIDIA output */
- float u = CLAMP(s[ch] - 0.5F, 0.0f, (float) size - 1.0f);
- icoord0[ch] = util_ifloor(u);
- icoord1[ch] = icoord0[ch] + 1;
- w[ch] = FRAC(u);
- }
- return;
- case PIPE_TEX_WRAP_CLAMP_TO_EDGE:
- /* fall-through */
- case PIPE_TEX_WRAP_CLAMP_TO_BORDER:
- for (ch = 0; ch < 4; ch++) {
- float u = CLAMP(s[ch], 0.5F, (float) size - 0.5F);
- u -= 0.5F;
- icoord0[ch] = util_ifloor(u);
- icoord1[ch] = icoord0[ch] + 1;
- if (icoord1[ch] > (int) size - 1)
- icoord1[ch] = size - 1;
- w[ch] = FRAC(u);
- }
- break;
- default:
- assert(0);
- }
-}
-
-
-static unsigned
-choose_cube_face(float rx, float ry, float rz, float *newS, float *newT)
-{
- /*
- major axis
- direction target sc tc ma
- ---------- ------------------------------- --- --- ---
- +rx TEXTURE_CUBE_MAP_POSITIVE_X_EXT -rz -ry rx
- -rx TEXTURE_CUBE_MAP_NEGATIVE_X_EXT +rz -ry rx
- +ry TEXTURE_CUBE_MAP_POSITIVE_Y_EXT +rx +rz ry
- -ry TEXTURE_CUBE_MAP_NEGATIVE_Y_EXT +rx -rz ry
- +rz TEXTURE_CUBE_MAP_POSITIVE_Z_EXT +rx -ry rz
- -rz TEXTURE_CUBE_MAP_NEGATIVE_Z_EXT -rx -ry rz
- */
- const float arx = fabsf(rx), ary = fabsf(ry), arz = fabsf(rz);
- unsigned face;
- float sc, tc, ma;
-
- if (arx > ary && arx > arz) {
- if (rx >= 0.0F) {
- face = PIPE_TEX_FACE_POS_X;
- sc = -rz;
- tc = -ry;
- ma = arx;
- }
- else {
- face = PIPE_TEX_FACE_NEG_X;
- sc = rz;
- tc = -ry;
- ma = arx;
- }
- }
- else if (ary > arx && ary > arz) {
- if (ry >= 0.0F) {
- face = PIPE_TEX_FACE_POS_Y;
- sc = rx;
- tc = rz;
- ma = ary;
- }
- else {
- face = PIPE_TEX_FACE_NEG_Y;
- sc = rx;
- tc = -rz;
- ma = ary;
- }
- }
- else {
- if (rz > 0.0F) {
- face = PIPE_TEX_FACE_POS_Z;
- sc = rx;
- tc = -ry;
- ma = arz;
- }
- else {
- face = PIPE_TEX_FACE_NEG_Z;
- sc = -rx;
- tc = -ry;
- ma = arz;
- }
- }
-
- *newS = ( sc / ma + 1.0F ) * 0.5F;
- *newT = ( tc / ma + 1.0F ) * 0.5F;
-
- return face;
-}
-
-
-/**
- * Examine the quad's texture coordinates to compute the partial
- * derivatives w.r.t X and Y, then compute lambda (level of detail).
- *
- * This is only done for fragment shaders, not vertex shaders.
- */
-static float
-compute_lambda(struct tgsi_sampler *tgsi_sampler,
- const float s[QUAD_SIZE],
- const float t[QUAD_SIZE],
- const float p[QUAD_SIZE],
- float lodbias)
-{
- const struct lp_shader_sampler *samp = lp_shader_sampler(tgsi_sampler);
- const struct pipe_texture *texture = samp->texture;
- const struct pipe_sampler_state *sampler = samp->sampler;
- float rho, lambda;
-
- if (samp->processor == TGSI_PROCESSOR_VERTEX)
- return lodbias;
-
- assert(sampler->normalized_coords);
-
- assert(s);
- {
- float dsdx = s[QUAD_BOTTOM_RIGHT] - s[QUAD_BOTTOM_LEFT];
- float dsdy = s[QUAD_TOP_LEFT] - s[QUAD_BOTTOM_LEFT];
- dsdx = fabsf(dsdx);
- dsdy = fabsf(dsdy);
- rho = MAX2(dsdx, dsdy) * texture->width[0];
- }
- if (t) {
- float dtdx = t[QUAD_BOTTOM_RIGHT] - t[QUAD_BOTTOM_LEFT];
- float dtdy = t[QUAD_TOP_LEFT] - t[QUAD_BOTTOM_LEFT];
- float max;
- dtdx = fabsf(dtdx);
- dtdy = fabsf(dtdy);
- max = MAX2(dtdx, dtdy) * texture->height[0];
- rho = MAX2(rho, max);
- }
- if (p) {
- float dpdx = p[QUAD_BOTTOM_RIGHT] - p[QUAD_BOTTOM_LEFT];
- float dpdy = p[QUAD_TOP_LEFT] - p[QUAD_BOTTOM_LEFT];
- float max;
- dpdx = fabsf(dpdx);
- dpdy = fabsf(dpdy);
- max = MAX2(dpdx, dpdy) * texture->depth[0];
- rho = MAX2(rho, max);
- }
-
- lambda = util_fast_log2(rho);
- lambda += lodbias + sampler->lod_bias;
- lambda = CLAMP(lambda, sampler->min_lod, sampler->max_lod);
-
- return lambda;
-}
-
-
-/**
- * Do several things here:
- * 1. Compute lambda from the texcoords, if needed
- * 2. Determine if we're minifying or magnifying
- * 3. If minifying, choose mipmap levels
- * 4. Return image filter to use within mipmap images
- * \param level0 Returns first mipmap level to sample from
- * \param level1 Returns second mipmap level to sample from
- * \param levelBlend Returns blend factor between levels, in [0,1]
- * \param imgFilter Returns either the min or mag filter, depending on lambda
- */
-static void
-choose_mipmap_levels(struct tgsi_sampler *tgsi_sampler,
- const float s[QUAD_SIZE],
- const float t[QUAD_SIZE],
- const float p[QUAD_SIZE],
- float lodbias,
- unsigned *level0, unsigned *level1, float *levelBlend,
- unsigned *imgFilter)
-{
- const struct lp_shader_sampler *samp = lp_shader_sampler(tgsi_sampler);
- const struct pipe_texture *texture = samp->texture;
- const struct pipe_sampler_state *sampler = samp->sampler;
-
- if (sampler->min_mip_filter == PIPE_TEX_MIPFILTER_NONE) {
- /* no mipmap selection needed */
- *level0 = *level1 = CLAMP((int) sampler->min_lod,
- 0, (int) texture->last_level);
-
- if (sampler->min_img_filter != sampler->mag_img_filter) {
- /* non-mipmapped texture, but still need to determine if doing
- * minification or magnification.
- */
- float lambda = compute_lambda(tgsi_sampler, s, t, p, lodbias);
- if (lambda <= 0.0) {
- *imgFilter = sampler->mag_img_filter;
- }
- else {
- *imgFilter = sampler->min_img_filter;
- }
- }
- else {
- *imgFilter = sampler->mag_img_filter;
- }
- }
- else {
- float lambda = compute_lambda(tgsi_sampler, s, t, p, lodbias);
-
- if (lambda <= 0.0) { /* XXX threshold depends on the filter */
- /* magnifying */
- *imgFilter = sampler->mag_img_filter;
- *level0 = *level1 = 0;
- }
- else {
- /* minifying */
- *imgFilter = sampler->min_img_filter;
-
- /* choose mipmap level(s) and compute the blend factor between them */
- if (sampler->min_mip_filter == PIPE_TEX_MIPFILTER_NEAREST) {
- /* Nearest mipmap level */
- const int lvl = (int) (lambda + 0.5);
- *level0 =
- *level1 = CLAMP(lvl, 0, (int) texture->last_level);
- }
- else {
- /* Linear interpolation between mipmap levels */
- const int lvl = (int) lambda;
- *level0 = CLAMP(lvl, 0, (int) texture->last_level);
- *level1 = CLAMP(lvl + 1, 0, (int) texture->last_level);
- *levelBlend = FRAC(lambda); /* blending weight between levels */
- }
- }
- }
-}
-
-
-/**
- * Get a texel from a texture, using the texture tile cache.
- *
- * \param face the cube face in 0..5
- * \param level the mipmap level
- * \param x the x coord of texel within 2D image
- * \param y the y coord of texel within 2D image
- * \param z which slice of a 3D texture
- * \param rgba the quad to put the texel/color into
- * \param j which element of the rgba quad to write to
- *
- * XXX maybe move this into lp_tile_cache.c and merge with the
- * lp_get_cached_tile_tex() function. Also, get 4 texels instead of 1...
- */
-static void
-get_texel_quad_2d(const struct tgsi_sampler *tgsi_sampler,
- unsigned face, unsigned level, int x, int y,
- const uint8_t *out[4])
-{
- const struct lp_shader_sampler *samp = lp_shader_sampler(tgsi_sampler);
-
- const struct llvmpipe_cached_tex_tile *tile
- = lp_get_cached_tex_tile(samp->cache,
- tex_tile_address(x, y, 0, face, level));
-
- y %= TEX_TILE_SIZE;
- x %= TEX_TILE_SIZE;
-
- out[0] = &tile->color[y ][x ][0];
- out[1] = &tile->color[y ][x+1][0];
- out[2] = &tile->color[y+1][x ][0];
- out[3] = &tile->color[y+1][x+1][0];
-}
-
-static INLINE const uint8_t *
-get_texel_2d_ptr(const struct tgsi_sampler *tgsi_sampler,
- unsigned face, unsigned level, int x, int y)
-{
- const struct lp_shader_sampler *samp = lp_shader_sampler(tgsi_sampler);
-
- const struct llvmpipe_cached_tex_tile *tile
- = lp_get_cached_tex_tile(samp->cache,
- tex_tile_address(x, y, 0, face, level));
-
- y %= TEX_TILE_SIZE;
- x %= TEX_TILE_SIZE;
-
- return &tile->color[y][x][0];
-}
-
-
-static void
-get_texel_quad_2d_mt(const struct tgsi_sampler *tgsi_sampler,
- unsigned face, unsigned level,
- int x0, int y0,
- int x1, int y1,
- const uint8_t *out[4])
-{
- unsigned i;
-
- for (i = 0; i < 4; i++) {
- unsigned tx = (i & 1) ? x1 : x0;
- unsigned ty = (i >> 1) ? y1 : y0;
-
- out[i] = get_texel_2d_ptr( tgsi_sampler, face, level, tx, ty );
- }
-}
-
-static void
-get_texel(const struct tgsi_sampler *tgsi_sampler,
- unsigned face, unsigned level, int x, int y, int z,
- float rgba[NUM_CHANNELS][QUAD_SIZE], unsigned j)
-{
- const struct lp_shader_sampler *samp = lp_shader_sampler(tgsi_sampler);
- const struct pipe_texture *texture = samp->texture;
- const struct pipe_sampler_state *sampler = samp->sampler;
-
- if (x < 0 || x >= (int) texture->width[level] ||
- y < 0 || y >= (int) texture->height[level] ||
- z < 0 || z >= (int) texture->depth[level]) {
- rgba[0][j] = sampler->border_color[0];
- rgba[1][j] = sampler->border_color[1];
- rgba[2][j] = sampler->border_color[2];
- rgba[3][j] = sampler->border_color[3];
- }
- else {
- const unsigned tx = x % TEX_TILE_SIZE;
- const unsigned ty = y % TEX_TILE_SIZE;
- const struct llvmpipe_cached_tex_tile *tile;
-
- tile = lp_get_cached_tex_tile(samp->cache,
- tex_tile_address(x, y, z, face, level));
-
- rgba[0][j] = ubyte_to_float(tile->color[ty][tx][0]);
- rgba[1][j] = ubyte_to_float(tile->color[ty][tx][1]);
- rgba[2][j] = ubyte_to_float(tile->color[ty][tx][2]);
- rgba[3][j] = ubyte_to_float(tile->color[ty][tx][3]);
- if (0)
- {
- debug_printf("Get texel %f %f %f %f from %s\n",
- rgba[0][j], rgba[1][j], rgba[2][j], rgba[3][j],
- pf_name(texture->format));
- }
- }
-}
-
-
-/**
- * Compare texcoord 'p' (aka R) against texture value 'rgba[0]'
- * When we sampled the depth texture, the depth value was put into all
- * RGBA channels. We look at the red channel here.
- * \param rgba quad of (depth) texel values
- * \param p texture 'P' components for four pixels in quad
- * \param j which pixel in the quad to test [0..3]
- */
-static INLINE void
-shadow_compare(const struct pipe_sampler_state *sampler,
- float rgba[NUM_CHANNELS][QUAD_SIZE],
- const float p[QUAD_SIZE],
- uint j)
-{
- int k;
- switch (sampler->compare_func) {
- case PIPE_FUNC_LESS:
- k = p[j] < rgba[0][j];
- break;
- case PIPE_FUNC_LEQUAL:
- k = p[j] <= rgba[0][j];
- break;
- case PIPE_FUNC_GREATER:
- k = p[j] > rgba[0][j];
- break;
- case PIPE_FUNC_GEQUAL:
- k = p[j] >= rgba[0][j];
- break;
- case PIPE_FUNC_EQUAL:
- k = p[j] == rgba[0][j];
- break;
- case PIPE_FUNC_NOTEQUAL:
- k = p[j] != rgba[0][j];
- break;
- case PIPE_FUNC_ALWAYS:
- k = 1;
- break;
- case PIPE_FUNC_NEVER:
- k = 0;
- break;
- default:
- k = 0;
- assert(0);
- break;
- }
-
- /* XXX returning result for default GL_DEPTH_TEXTURE_MODE = GL_LUMINANCE */
- rgba[0][j] = rgba[1][j] = rgba[2][j] = (float) k;
- rgba[3][j] = 1.0F;
-}
-
-
-/**
- * As above, but do four z/texture comparisons.
- */
-static INLINE void
-shadow_compare4(const struct pipe_sampler_state *sampler,
- float rgba[NUM_CHANNELS][QUAD_SIZE],
- const float p[QUAD_SIZE])
-{
- int j, k0, k1, k2, k3;
- float val;
-
- /* compare four texcoords vs. four texture samples */
- switch (sampler->compare_func) {
- case PIPE_FUNC_LESS:
- k0 = p[0] < rgba[0][0];
- k1 = p[1] < rgba[0][1];
- k2 = p[2] < rgba[0][2];
- k3 = p[3] < rgba[0][3];
- break;
- case PIPE_FUNC_LEQUAL:
- k0 = p[0] <= rgba[0][0];
- k1 = p[1] <= rgba[0][1];
- k2 = p[2] <= rgba[0][2];
- k3 = p[3] <= rgba[0][3];
- break;
- case PIPE_FUNC_GREATER:
- k0 = p[0] > rgba[0][0];
- k1 = p[1] > rgba[0][1];
- k2 = p[2] > rgba[0][2];
- k3 = p[3] > rgba[0][3];
- break;
- case PIPE_FUNC_GEQUAL:
- k0 = p[0] >= rgba[0][0];
- k1 = p[1] >= rgba[0][1];
- k2 = p[2] >= rgba[0][2];
- k3 = p[3] >= rgba[0][3];
- break;
- case PIPE_FUNC_EQUAL:
- k0 = p[0] == rgba[0][0];
- k1 = p[1] == rgba[0][1];
- k2 = p[2] == rgba[0][2];
- k3 = p[3] == rgba[0][3];
- break;
- case PIPE_FUNC_NOTEQUAL:
- k0 = p[0] != rgba[0][0];
- k1 = p[1] != rgba[0][1];
- k2 = p[2] != rgba[0][2];
- k3 = p[3] != rgba[0][3];
- break;
- case PIPE_FUNC_ALWAYS:
- k0 = k1 = k2 = k3 = 1;
- break;
- case PIPE_FUNC_NEVER:
- k0 = k1 = k2 = k3 = 0;
- break;
- default:
- k0 = k1 = k2 = k3 = 0;
- assert(0);
- break;
- }
-
- /* convert four pass/fail values to an intensity in [0,1] */
- val = 0.25F * (k0 + k1 + k2 + k3);
-
- /* XXX returning result for default GL_DEPTH_TEXTURE_MODE = GL_LUMINANCE */
- for (j = 0; j < 4; j++) {
- rgba[0][j] = rgba[1][j] = rgba[2][j] = val;
- rgba[3][j] = 1.0F;
- }
-}
-
-
-
-static void
-lp_get_samples_2d_linear_repeat_POT(struct tgsi_sampler *tgsi_sampler,
- const float s[QUAD_SIZE],
- const float t[QUAD_SIZE],
- const float p[QUAD_SIZE],
- float lodbias,
- float rgba[NUM_CHANNELS][QUAD_SIZE])
-{
- const struct lp_shader_sampler *samp = lp_shader_sampler(tgsi_sampler);
- unsigned j;
- unsigned level = samp->level;
- unsigned xpot = 1 << (samp->xpot - level);
- unsigned ypot = 1 << (samp->ypot - level);
- unsigned xmax = (xpot - 1) & (TEX_TILE_SIZE - 1); /* MIN2(TEX_TILE_SIZE, xpot) - 1; */
- unsigned ymax = (ypot - 1) & (TEX_TILE_SIZE - 1); /* MIN2(TEX_TILE_SIZE, ypot) - 1; */
-
- for (j = 0; j < QUAD_SIZE; j++) {
- int c;
-
- float u = s[j] * xpot - 0.5F;
- float v = t[j] * ypot - 0.5F;
-
- int uflr = util_ifloor(u);
- int vflr = util_ifloor(v);
-
- float xw = u - (float)uflr;
- float yw = v - (float)vflr;
-
- int x0 = uflr & (xpot - 1);
- int y0 = vflr & (ypot - 1);
-
- const uint8_t *tx[4];
-
-
- /* Can we fetch all four at once:
- */
- if (x0 < xmax && y0 < ymax)
- {
- get_texel_quad_2d(tgsi_sampler, 0, level, x0, y0, tx);
- }
- else
- {
- unsigned x1 = (x0 + 1) & (xpot - 1);
- unsigned y1 = (y0 + 1) & (ypot - 1);
- get_texel_quad_2d_mt(tgsi_sampler, 0, level,
- x0, y0, x1, y1, tx);
- }
-
-
- /* interpolate R, G, B, A */
- for (c = 0; c < 4; c++) {
- rgba[c][j] = lerp_2d(xw, yw,
- ubyte_to_float(tx[0][c]), ubyte_to_float(tx[1][c]),
- ubyte_to_float(tx[2][c]), ubyte_to_float(tx[3][c]));
- }
- }
-}
-
-
-static void
-lp_get_samples_2d_nearest_repeat_POT(struct tgsi_sampler *tgsi_sampler,
- const float s[QUAD_SIZE],
- const float t[QUAD_SIZE],
- const float p[QUAD_SIZE],
- float lodbias,
- float rgba[NUM_CHANNELS][QUAD_SIZE])
-{
- const struct lp_shader_sampler *samp = lp_shader_sampler(tgsi_sampler);
- unsigned j;
- unsigned level = samp->level;
- unsigned xpot = 1 << (samp->xpot - level);
- unsigned ypot = 1 << (samp->ypot - level);
-
- for (j = 0; j < QUAD_SIZE; j++) {
- int c;
-
- float u = s[j] * xpot;
- float v = t[j] * ypot;
-
- int uflr = util_ifloor(u);
- int vflr = util_ifloor(v);
-
- int x0 = uflr & (xpot - 1);
- int y0 = vflr & (ypot - 1);
-
- const uint8_t *out = get_texel_2d_ptr(tgsi_sampler, 0, level, x0, y0);
-
- for (c = 0; c < 4; c++) {
- rgba[c][j] = ubyte_to_float(out[c]);
- }
- }
-}
-
-
-static void
-lp_get_samples_2d_nearest_clamp_POT(struct tgsi_sampler *tgsi_sampler,
- const float s[QUAD_SIZE],
- const float t[QUAD_SIZE],
- const float p[QUAD_SIZE],
- float lodbias,
- float rgba[NUM_CHANNELS][QUAD_SIZE])
-{
- const struct lp_shader_sampler *samp = lp_shader_sampler(tgsi_sampler);
- unsigned j;
- unsigned level = samp->level;
- unsigned xpot = 1 << (samp->xpot - level);
- unsigned ypot = 1 << (samp->ypot - level);
-
- for (j = 0; j < QUAD_SIZE; j++) {
- int c;
-
- float u = s[j] * xpot;
- float v = t[j] * ypot;
-
- int x0, y0;
- const uint8_t *out;
-
- x0 = util_ifloor(u);
- if (x0 < 0)
- x0 = 0;
- else if (x0 > xpot - 1)
- x0 = xpot - 1;
-
- y0 = util_ifloor(v);
- if (y0 < 0)
- y0 = 0;
- else if (y0 > ypot - 1)
- y0 = ypot - 1;
-
- out = get_texel_2d_ptr(tgsi_sampler, 0, level, x0, y0);
-
- for (c = 0; c < 4; c++) {
- rgba[c][j] = ubyte_to_float(out[c]);
- }
- }
-}
-
-
-static void
-lp_get_samples_2d_linear_mip_linear_repeat_POT(struct tgsi_sampler *tgsi_sampler,
- const float s[QUAD_SIZE],
- const float t[QUAD_SIZE],
- const float p[QUAD_SIZE],
- float lodbias,
- float rgba[NUM_CHANNELS][QUAD_SIZE])
-{
- struct lp_shader_sampler *samp = lp_shader_sampler(tgsi_sampler);
- const struct pipe_texture *texture = samp->texture;
- int level0;
- float lambda;
-
- lambda = compute_lambda(tgsi_sampler, s, t, p, lodbias);
- level0 = (int)lambda;
-
- if (lambda < 0.0) {
- samp->level = 0;
- lp_get_samples_2d_linear_repeat_POT( tgsi_sampler,
- s, t, p, 0, rgba );
- }
- else if (level0 >= texture->last_level) {
- samp->level = texture->last_level;
- lp_get_samples_2d_linear_repeat_POT( tgsi_sampler,
- s, t, p, 0, rgba );
- }
- else {
- float levelBlend = lambda - level0;
- float rgba0[4][4];
- float rgba1[4][4];
- int c,j;
-
- samp->level = level0;
- lp_get_samples_2d_linear_repeat_POT( tgsi_sampler,
- s, t, p, 0, rgba0 );
-
- samp->level = level0+1;
- lp_get_samples_2d_linear_repeat_POT( tgsi_sampler,
- s, t, p, 0, rgba1 );
-
- for (j = 0; j < QUAD_SIZE; j++) {
- for (c = 0; c < 4; c++) {
- rgba[c][j] = lerp(levelBlend, rgba0[c][j], rgba1[c][j]);
- }
- }
- }
-}
-
-/**
- * Common code for sampling 1D/2D/cube textures.
- * Could probably extend for 3D...
- */
-static void
-lp_get_samples_2d_common(struct tgsi_sampler *tgsi_sampler,
- const float s[QUAD_SIZE],
- const float t[QUAD_SIZE],
- const float p[QUAD_SIZE],
- float lodbias,
- float rgba[NUM_CHANNELS][QUAD_SIZE],
- const unsigned faces[4])
-{
- const struct lp_shader_sampler *samp = lp_shader_sampler(tgsi_sampler);
- const struct pipe_texture *texture = samp->texture;
- const struct pipe_sampler_state *sampler = samp->sampler;
- unsigned level0, level1, j, imgFilter;
- int width, height;
- float levelBlend = 0.0F;
-
- choose_mipmap_levels(tgsi_sampler, s, t, p,
- lodbias,
- &level0, &level1, &levelBlend, &imgFilter);
-
- assert(sampler->normalized_coords);
-
- width = texture->width[level0];
- height = texture->height[level0];
-
- assert(width > 0);
-
- switch (imgFilter) {
- case PIPE_TEX_FILTER_NEAREST:
- {
- int x[4], y[4];
- nearest_texcoord_4(sampler->wrap_s, s, width, x);
- nearest_texcoord_4(sampler->wrap_t, t, height, y);
-
- for (j = 0; j < QUAD_SIZE; j++) {
- get_texel(tgsi_sampler, faces[j], level0, x[j], y[j], 0, rgba, j);
- if (sampler->compare_mode == PIPE_TEX_COMPARE_R_TO_TEXTURE) {
- shadow_compare(sampler, rgba, p, j);
- }
-
- if (level0 != level1) {
- /* get texels from second mipmap level and blend */
- float rgba2[4][4];
- unsigned c;
- x[j] /= 2;
- y[j] /= 2;
- get_texel(tgsi_sampler, faces[j], level1, x[j], y[j], 0,
- rgba2, j);
- if (sampler->compare_mode == PIPE_TEX_COMPARE_R_TO_TEXTURE){
- shadow_compare(sampler, rgba2, p, j);
- }
-
- for (c = 0; c < NUM_CHANNELS; c++) {
- rgba[c][j] = lerp(levelBlend, rgba[c][j], rgba2[c][j]);
- }
- }
- }
- }
- break;
- case PIPE_TEX_FILTER_LINEAR:
- case PIPE_TEX_FILTER_ANISO:
- {
- int x0[4], y0[4], x1[4], y1[4];
- float xw[4], yw[4]; /* weights */
-
- linear_texcoord_4(sampler->wrap_s, s, width, x0, x1, xw);
- linear_texcoord_4(sampler->wrap_t, t, height, y0, y1, yw);
-
- for (j = 0; j < QUAD_SIZE; j++) {
- float tx[4][4]; /* texels */
- int c;
- get_texel(tgsi_sampler, faces[j], level0, x0[j], y0[j], 0, tx, 0);
- get_texel(tgsi_sampler, faces[j], level0, x1[j], y0[j], 0, tx, 1);
- get_texel(tgsi_sampler, faces[j], level0, x0[j], y1[j], 0, tx, 2);
- get_texel(tgsi_sampler, faces[j], level0, x1[j], y1[j], 0, tx, 3);
- if (sampler->compare_mode == PIPE_TEX_COMPARE_R_TO_TEXTURE) {
- shadow_compare4(sampler, tx, p);
- }
-
- /* interpolate R, G, B, A */
- for (c = 0; c < 4; c++) {
- rgba[c][j] = lerp_2d(xw[j], yw[j],
- tx[c][0], tx[c][1],
- tx[c][2], tx[c][3]);
- }
-
- if (level0 != level1) {
- /* get texels from second mipmap level and blend */
- float rgba2[4][4];
-
- /* XXX: This is incorrect -- will often end up with (x0
- * == x1 && y0 == y1), meaning that we fetch the same
- * texel four times and linearly interpolate between
- * identical values. The correct approach would be to
- * call linear_texcoord again for the second level.
- */
- x0[j] /= 2;
- y0[j] /= 2;
- x1[j] /= 2;
- y1[j] /= 2;
- get_texel(tgsi_sampler, faces[j], level1, x0[j], y0[j], 0, tx, 0);
- get_texel(tgsi_sampler, faces[j], level1, x1[j], y0[j], 0, tx, 1);
- get_texel(tgsi_sampler, faces[j], level1, x0[j], y1[j], 0, tx, 2);
- get_texel(tgsi_sampler, faces[j], level1, x1[j], y1[j], 0, tx, 3);
- if (sampler->compare_mode == PIPE_TEX_COMPARE_R_TO_TEXTURE){
- shadow_compare4(sampler, tx, p);
- }
-
- /* interpolate R, G, B, A */
- for (c = 0; c < 4; c++) {
- rgba2[c][j] = lerp_2d(xw[j], yw[j],
- tx[c][0], tx[c][1], tx[c][2], tx[c][3]);
- }
-
- for (c = 0; c < NUM_CHANNELS; c++) {
- rgba[c][j] = lerp(levelBlend, rgba[c][j], rgba2[c][j]);
- }
- }
- }
- }
- break;
- default:
- assert(0);
- }
-}
-
-
-static INLINE void
-lp_get_samples_1d(struct tgsi_sampler *sampler,
- const float s[QUAD_SIZE],
- const float t[QUAD_SIZE],
- const float p[QUAD_SIZE],
- float lodbias,
- float rgba[NUM_CHANNELS][QUAD_SIZE])
-{
- static const unsigned faces[4] = {0, 0, 0, 0};
- static const float tzero[4] = {0, 0, 0, 0};
- lp_get_samples_2d_common(sampler, s, tzero, NULL,
- lodbias, rgba, faces);
-}
-
-
-static INLINE void
-lp_get_samples_2d(struct tgsi_sampler *sampler,
- const float s[QUAD_SIZE],
- const float t[QUAD_SIZE],
- const float p[QUAD_SIZE],
- float lodbias,
- float rgba[NUM_CHANNELS][QUAD_SIZE])
-{
- static const unsigned faces[4] = {0, 0, 0, 0};
- lp_get_samples_2d_common(sampler, s, t, p,
- lodbias, rgba, faces);
-}
-
-
-static INLINE void
-lp_get_samples_3d(struct tgsi_sampler *tgsi_sampler,
- const float s[QUAD_SIZE],
- const float t[QUAD_SIZE],
- const float p[QUAD_SIZE],
- float lodbias,
- float rgba[NUM_CHANNELS][QUAD_SIZE])
-{
- const struct lp_shader_sampler *samp = lp_shader_sampler(tgsi_sampler);
- const struct pipe_texture *texture = samp->texture;
- const struct pipe_sampler_state *sampler = samp->sampler;
- /* get/map pipe_surfaces corresponding to 3D tex slices */
- unsigned level0, level1, j, imgFilter;
- int width, height, depth;
- float levelBlend;
- const uint face = 0;
-
- choose_mipmap_levels(tgsi_sampler, s, t, p,
- lodbias,
- &level0, &level1, &levelBlend, &imgFilter);
-
- assert(sampler->normalized_coords);
-
- width = texture->width[level0];
- height = texture->height[level0];
- depth = texture->depth[level0];
-
- assert(width > 0);
- assert(height > 0);
- assert(depth > 0);
-
- switch (imgFilter) {
- case PIPE_TEX_FILTER_NEAREST:
- {
- int x[4], y[4], z[4];
- nearest_texcoord_4(sampler->wrap_s, s, width, x);
- nearest_texcoord_4(sampler->wrap_t, t, height, y);
- nearest_texcoord_4(sampler->wrap_r, p, depth, z);
- for (j = 0; j < QUAD_SIZE; j++) {
- get_texel(tgsi_sampler, face, level0, x[j], y[j], z[j], rgba, j);
- if (level0 != level1) {
- /* get texels from second mipmap level and blend */
- float rgba2[4][4];
- unsigned c;
- x[j] /= 2;
- y[j] /= 2;
- z[j] /= 2;
- get_texel(tgsi_sampler, face, level1, x[j], y[j], z[j], rgba2, j);
- for (c = 0; c < NUM_CHANNELS; c++) {
- rgba[c][j] = lerp(levelBlend, rgba2[c][j], rgba[c][j]);
- }
- }
- }
- }
- break;
- case PIPE_TEX_FILTER_LINEAR:
- case PIPE_TEX_FILTER_ANISO:
- {
- int x0[4], x1[4], y0[4], y1[4], z0[4], z1[4];
- float xw[4], yw[4], zw[4]; /* interpolation weights */
- linear_texcoord_4(sampler->wrap_s, s, width, x0, x1, xw);
- linear_texcoord_4(sampler->wrap_t, t, height, y0, y1, yw);
- linear_texcoord_4(sampler->wrap_r, p, depth, z0, z1, zw);
-
- for (j = 0; j < QUAD_SIZE; j++) {
- int c;
- float tx0[4][4], tx1[4][4];
- get_texel(tgsi_sampler, face, level0, x0[j], y0[j], z0[j], tx0, 0);
- get_texel(tgsi_sampler, face, level0, x1[j], y0[j], z0[j], tx0, 1);
- get_texel(tgsi_sampler, face, level0, x0[j], y1[j], z0[j], tx0, 2);
- get_texel(tgsi_sampler, face, level0, x1[j], y1[j], z0[j], tx0, 3);
- get_texel(tgsi_sampler, face, level0, x0[j], y0[j], z1[j], tx1, 0);
- get_texel(tgsi_sampler, face, level0, x1[j], y0[j], z1[j], tx1, 1);
- get_texel(tgsi_sampler, face, level0, x0[j], y1[j], z1[j], tx1, 2);
- get_texel(tgsi_sampler, face, level0, x1[j], y1[j], z1[j], tx1, 3);
-
- /* interpolate R, G, B, A */
- for (c = 0; c < 4; c++) {
- rgba[c][j] = lerp_3d(xw[j], yw[j], zw[j],
- tx0[c][0], tx0[c][1],
- tx0[c][2], tx0[c][3],
- tx1[c][0], tx1[c][1],
- tx1[c][2], tx1[c][3]);
- }
-
- if (level0 != level1) {
- /* get texels from second mipmap level and blend */
- float rgba2[4][4];
- x0[j] /= 2;
- y0[j] /= 2;
- z0[j] /= 2;
- x1[j] /= 2;
- y1[j] /= 2;
- z1[j] /= 2;
- get_texel(tgsi_sampler, face, level1, x0[j], y0[j], z0[j], tx0, 0);
- get_texel(tgsi_sampler, face, level1, x1[j], y0[j], z0[j], tx0, 1);
- get_texel(tgsi_sampler, face, level1, x0[j], y1[j], z0[j], tx0, 2);
- get_texel(tgsi_sampler, face, level1, x1[j], y1[j], z0[j], tx0, 3);
- get_texel(tgsi_sampler, face, level1, x0[j], y0[j], z1[j], tx1, 0);
- get_texel(tgsi_sampler, face, level1, x1[j], y0[j], z1[j], tx1, 1);
- get_texel(tgsi_sampler, face, level1, x0[j], y1[j], z1[j], tx1, 2);
- get_texel(tgsi_sampler, face, level1, x1[j], y1[j], z1[j], tx1, 3);
-
- /* interpolate R, G, B, A */
- for (c = 0; c < 4; c++) {
- rgba2[c][j] = lerp_3d(xw[j], yw[j], zw[j],
- tx0[c][0], tx0[c][1],
- tx0[c][2], tx0[c][3],
- tx1[c][0], tx1[c][1],
- tx1[c][2], tx1[c][3]);
- }
-
- /* blend mipmap levels */
- for (c = 0; c < NUM_CHANNELS; c++) {
- rgba[c][j] = lerp(levelBlend, rgba[c][j], rgba2[c][j]);
- }
- }
- }
- }
- break;
- default:
- assert(0);
- }
-}
-
-
-static void
-lp_get_samples_cube(struct tgsi_sampler *sampler,
- const float s[QUAD_SIZE],
- const float t[QUAD_SIZE],
- const float p[QUAD_SIZE],
- float lodbias,
- float rgba[NUM_CHANNELS][QUAD_SIZE])
-{
- unsigned faces[QUAD_SIZE], j;
- float ssss[4], tttt[4];
- for (j = 0; j < QUAD_SIZE; j++) {
- faces[j] = choose_cube_face(s[j], t[j], p[j], ssss + j, tttt + j);
- }
- lp_get_samples_2d_common(sampler, ssss, tttt, NULL,
- lodbias, rgba, faces);
-}
-
-
-static void
-lp_get_samples_rect(struct tgsi_sampler *tgsi_sampler,
- const float s[QUAD_SIZE],
- const float t[QUAD_SIZE],
- const float p[QUAD_SIZE],
- float lodbias,
- float rgba[NUM_CHANNELS][QUAD_SIZE])
-{
- const struct lp_shader_sampler *samp = lp_shader_sampler(tgsi_sampler);
- const struct pipe_texture *texture = samp->texture;
- const struct pipe_sampler_state *sampler = samp->sampler;
- const uint face = 0;
- unsigned level0, level1, j, imgFilter;
- int width, height;
- float levelBlend;
-
- choose_mipmap_levels(tgsi_sampler, s, t, p,
- lodbias,
- &level0, &level1, &levelBlend, &imgFilter);
-
- /* texture RECTS cannot be mipmapped */
- assert(level0 == level1);
-
- width = texture->width[level0];
- height = texture->height[level0];
-
- assert(width > 0);
-
- switch (imgFilter) {
- case PIPE_TEX_FILTER_NEAREST:
- {
- int x[4], y[4];
- nearest_texcoord_unnorm_4(sampler->wrap_s, s, width, x);
- nearest_texcoord_unnorm_4(sampler->wrap_t, t, height, y);
- for (j = 0; j < QUAD_SIZE; j++) {
- get_texel(tgsi_sampler, face, level0, x[j], y[j], 0, rgba, j);
- if (sampler->compare_mode == PIPE_TEX_COMPARE_R_TO_TEXTURE) {
- shadow_compare(sampler, rgba, p, j);
- }
- }
- }
- break;
- case PIPE_TEX_FILTER_LINEAR:
- case PIPE_TEX_FILTER_ANISO:
- {
- int x0[4], y0[4], x1[4], y1[4];
- float xw[4], yw[4]; /* weights */
- linear_texcoord_unnorm_4(sampler->wrap_s, s, width, x0, x1, xw);
- linear_texcoord_unnorm_4(sampler->wrap_t, t, height, y0, y1, yw);
- for (j = 0; j < QUAD_SIZE; j++) {
- float tx[4][4]; /* texels */
- int c;
- get_texel(tgsi_sampler, face, level0, x0[j], y0[j], 0, tx, 0);
- get_texel(tgsi_sampler, face, level0, x1[j], y0[j], 0, tx, 1);
- get_texel(tgsi_sampler, face, level0, x0[j], y1[j], 0, tx, 2);
- get_texel(tgsi_sampler, face, level0, x1[j], y1[j], 0, tx, 3);
- if (sampler->compare_mode == PIPE_TEX_COMPARE_R_TO_TEXTURE) {
- shadow_compare4(sampler, tx, p);
- }
- for (c = 0; c < 4; c++) {
- rgba[c][j] = lerp_2d(xw[j], yw[j],
- tx[c][0], tx[c][1], tx[c][2], tx[c][3]);
- }
- }
- }
- break;
- default:
- assert(0);
- }
-}
-
-
-/**
- * Error condition handler
- */
-static INLINE void
-lp_get_samples_null(struct tgsi_sampler *tgsi_sampler,
- const float s[QUAD_SIZE],
- const float t[QUAD_SIZE],
- const float p[QUAD_SIZE],
- float lodbias,
- float rgba[NUM_CHANNELS][QUAD_SIZE])
-{
- int i,j;
-
- for (i = 0; i < 4; i++)
- for (j = 0; j < 4; j++)
- rgba[i][j] = 1.0;
-}
-
-/**
- * Called via tgsi_sampler::get_samples() when using a sampler for the
- * first time. Determine the actual sampler function, link it in and
- * call it.
- */
-void
-lp_get_samples(struct tgsi_sampler *tgsi_sampler,
- const float s[QUAD_SIZE],
- const float t[QUAD_SIZE],
- const float p[QUAD_SIZE],
- float lodbias,
- float rgba[NUM_CHANNELS][QUAD_SIZE])
-{
- struct lp_shader_sampler *samp = lp_shader_sampler(tgsi_sampler);
- const struct pipe_texture *texture = samp->texture;
- const struct pipe_sampler_state *sampler = samp->sampler;
-
- /* Default to the 'undefined' case:
- */
- tgsi_sampler->get_samples = lp_get_samples_null;
-
- if (!texture) {
- assert(0); /* is this legal?? */
- goto out;
- }
-
- if (!sampler->normalized_coords) {
- assert (texture->target == PIPE_TEXTURE_2D);
- tgsi_sampler->get_samples = lp_get_samples_rect;
- goto out;
- }
-
- switch (texture->target) {
- case PIPE_TEXTURE_1D:
- tgsi_sampler->get_samples = lp_get_samples_1d;
- break;
- case PIPE_TEXTURE_2D:
- tgsi_sampler->get_samples = lp_get_samples_2d;
- break;
- case PIPE_TEXTURE_3D:
- tgsi_sampler->get_samples = lp_get_samples_3d;
- break;
- case PIPE_TEXTURE_CUBE:
- tgsi_sampler->get_samples = lp_get_samples_cube;
- break;
- default:
- assert(0);
- break;
- }
-
- /* Do this elsewhere:
- */
- samp->xpot = util_unsigned_logbase2( samp->texture->width[0] );
- samp->ypot = util_unsigned_logbase2( samp->texture->height[0] );
-
- /* Try to hook in a faster sampler. Ultimately we'll have to
- * code-generate these. Luckily most of this looks like it is
- * orthogonal state within the sampler.
- */
- if (texture->target == PIPE_TEXTURE_2D &&
- sampler->min_img_filter == sampler->mag_img_filter &&
- sampler->wrap_s == sampler->wrap_t &&
- sampler->compare_mode == FALSE &&
- sampler->normalized_coords)
- {
- if (sampler->min_mip_filter == PIPE_TEX_MIPFILTER_NONE) {
- samp->level = CLAMP((int) sampler->min_lod,
- 0, (int) texture->last_level);
-
- if (sampler->wrap_s == PIPE_TEX_WRAP_REPEAT) {
- switch (sampler->min_img_filter) {
- case PIPE_TEX_FILTER_NEAREST:
- tgsi_sampler->get_samples = lp_get_samples_2d_nearest_repeat_POT;
- break;
- case PIPE_TEX_FILTER_LINEAR:
- tgsi_sampler->get_samples = lp_get_samples_2d_linear_repeat_POT;
- break;
- default:
- break;
- }
- }
- else if (sampler->wrap_s == PIPE_TEX_WRAP_CLAMP) {
- switch (sampler->min_img_filter) {
- case PIPE_TEX_FILTER_NEAREST:
- tgsi_sampler->get_samples = lp_get_samples_2d_nearest_clamp_POT;
- break;
- default:
- break;
- }
- }
- }
- else if (sampler->min_mip_filter == PIPE_TEX_MIPFILTER_LINEAR) {
- if (sampler->wrap_s == PIPE_TEX_WRAP_REPEAT) {
- switch (sampler->min_img_filter) {
- case PIPE_TEX_FILTER_LINEAR:
- tgsi_sampler->get_samples = lp_get_samples_2d_linear_mip_linear_repeat_POT;
- break;
- default:
- break;
- }
- }
- }
- }
- else if (0) {
- _debug_printf("target %d/%d min_mip %d/%d min_img %d/%d wrap %d/%d compare %d/%d norm %d/%d\n",
- texture->target, PIPE_TEXTURE_2D,
- sampler->min_mip_filter, PIPE_TEX_MIPFILTER_NONE,
- sampler->min_img_filter, sampler->mag_img_filter,
- sampler->wrap_s, sampler->wrap_t,
- sampler->compare_mode, FALSE,
- sampler->normalized_coords, TRUE);
- }
-
-out:
- tgsi_sampler->get_samples( tgsi_sampler, s, t, p, lodbias, rgba );
-}
-
-
-void PIPE_CDECL
-lp_fetch_texel_soa( struct tgsi_sampler **samplers,
- uint32_t unit,
- float *store )
-{
- struct tgsi_sampler *sampler = samplers[unit];
-
-#if 0
- uint j;
-
- debug_printf("%s sampler: %p (%p) store: %p\n",
- __FUNCTION__,
- sampler, *sampler,
- store );
-
- debug_printf("lodbias %f\n", store[12]);
-
- for (j = 0; j < 4; j++)
- debug_printf("sample %d texcoord %f %f\n",
- j,
- store[0+j],
- store[4+j]);
-#endif
-
- {
- float rgba[NUM_CHANNELS][QUAD_SIZE];
- sampler->get_samples(sampler,
- &store[0],
- &store[4],
- &store[8],
- 0.0f, /*store[12], lodbias */
- rgba);
- memcpy(store, rgba, sizeof rgba);
- }
-
-#if 0
- for (j = 0; j < 4; j++)
- debug_printf("sample %d result %f %f %f %f\n",
- j,
- store[0+j],
- store[4+j],
- store[8+j],
- store[12+j]);
-#endif
-}
-
-
-#include "lp_bld_type.h"
-#include "lp_bld_intr.h"
-#include "lp_bld_tgsi.h"
-
-
-struct lp_c_sampler_soa
-{
- struct lp_build_sampler_soa base;
-
- LLVMValueRef context_ptr;
-
- LLVMValueRef samplers_ptr;
-
- /** Coords/texels store */
- LLVMValueRef store_ptr;
-};
-
-
-static void
-lp_c_sampler_soa_destroy(struct lp_build_sampler_soa *sampler)
-{
- FREE(sampler);
-}
-
-
-static void
-lp_c_sampler_soa_emit_fetch_texel(struct lp_build_sampler_soa *_sampler,
- LLVMBuilderRef builder,
- struct lp_type type,
- unsigned unit,
- unsigned num_coords,
- const LLVMValueRef *coords,
- LLVMValueRef lodbias,
- LLVMValueRef *texel)
-{
- struct lp_c_sampler_soa *sampler = (struct lp_c_sampler_soa *)_sampler;
- LLVMTypeRef vec_type = LLVMTypeOf(coords[0]);
- LLVMValueRef args[3];
- unsigned i;
-
- if(!sampler->samplers_ptr)
- sampler->samplers_ptr = lp_jit_context_samplers(builder, sampler->context_ptr);
-
- if(!sampler->store_ptr)
- sampler->store_ptr = LLVMBuildArrayAlloca(builder,
- vec_type,
- LLVMConstInt(LLVMInt32Type(), 4, 0),
- "texel_store");
-
- for (i = 0; i < num_coords; i++) {
- LLVMValueRef index = LLVMConstInt(LLVMInt32Type(), i, 0);
- LLVMValueRef coord_ptr = LLVMBuildGEP(builder, sampler->store_ptr, &index, 1, "");
- LLVMBuildStore(builder, coords[i], coord_ptr);
- }
-
- args[0] = sampler->samplers_ptr;
- args[1] = LLVMConstInt(LLVMInt32Type(), unit, 0);
- args[2] = sampler->store_ptr;
-
- lp_build_intrinsic(builder, "fetch_texel", LLVMVoidType(), args, 3);
-
- for (i = 0; i < NUM_CHANNELS; ++i) {
- LLVMValueRef index = LLVMConstInt(LLVMInt32Type(), i, 0);
- LLVMValueRef texel_ptr = LLVMBuildGEP(builder, sampler->store_ptr, &index, 1, "");
- texel[i] = LLVMBuildLoad(builder, texel_ptr, "");
- }
-}
-
-
-struct lp_build_sampler_soa *
-lp_c_sampler_soa_create(LLVMValueRef context_ptr)
-{
- struct lp_c_sampler_soa *sampler;
-
- sampler = CALLOC_STRUCT(lp_c_sampler_soa);
- if(!sampler)
- return NULL;
-
- sampler->base.destroy = lp_c_sampler_soa_destroy;
- sampler->base.emit_fetch_texel = lp_c_sampler_soa_emit_fetch_texel;
- sampler->context_ptr = context_ptr;
-
- return &sampler->base;
-}
-
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