-/* $Id: s_aatriangle.c,v 1.18 2001/05/29 15:23:15 brianp Exp $ */
-
/*
* Mesa 3-D graphics library
- * Version: 3.5
*
- * Copyright (C) 1999-2001 Brian Paul All Rights Reserved.
+ * Copyright (C) 1999-2007 Brian Paul 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"),
* 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 NONINFRINGEMENT. IN NO EVENT SHALL
- * BRIAN PAUL 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.
+ * THE AUTHORS OR COPYRIGHT HOLDERS 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.
*/
*/
-#include "mem.h"
-#include "mmath.h"
+#include "main/glheader.h"
+#include "main/context.h"
+#include "main/macros.h"
+#include "main/state.h"
#include "s_aatriangle.h"
#include "s_context.h"
#include "s_span.h"
/*
* Compute coefficients of a plane using the X,Y coords of the v0, v1, v2
* vertices and the given Z values.
+ * A point (x,y,z) lies on plane iff a*x+b*y+c*z+d = 0.
*/
-static INLINE void
+static inline void
compute_plane(const GLfloat v0[], const GLfloat v1[], const GLfloat v2[],
GLfloat z0, GLfloat z1, GLfloat z2, GLfloat plane[4])
{
const GLfloat qy = v2[1] - v0[1];
const GLfloat qz = z2 - z0;
+ /* Crossproduct "(a,b,c):= dv1 x dv2" is orthogonal to plane. */
const GLfloat a = py * qz - pz * qy;
const GLfloat b = pz * qx - px * qz;
const GLfloat c = px * qy - py * qx;
+ /* Point on the plane = "r*(a,b,c) + w", with fixed "r" depending
+ on the distance of plane from origin and arbitrary "w" parallel
+ to the plane. */
+ /* The scalar product "(r*(a,b,c)+w)*(a,b,c)" is "r*(a^2+b^2+c^2)",
+ which is equal to "-d" below. */
const GLfloat d = -(a * v0[0] + b * v0[1] + c * z0);
plane[0] = a;
/*
* Compute coefficients of a plane with a constant Z value.
*/
-static INLINE void
+static inline void
constant_plane(GLfloat value, GLfloat plane[4])
{
plane[0] = 0.0;
/*
* Solve plane equation for Z at (X,Y).
*/
-static INLINE GLfloat
+static inline GLfloat
solve_plane(GLfloat x, GLfloat y, const GLfloat plane[4])
{
- const GLfloat z = (plane[3] + plane[0] * x + plane[1] * y) / -plane[2];
- return z;
+ assert(plane[2] != 0.0F);
+ return (plane[3] + plane[0] * x + plane[1] * y) / -plane[2];
}
/*
- * Return 1 / solve_plane().
+ * Solve plane and return clamped GLchan value.
*/
-static INLINE GLfloat
-solve_plane_recip(GLfloat x, GLfloat y, const GLfloat plane[4])
+static inline GLchan
+solve_plane_chan(GLfloat x, GLfloat y, const GLfloat plane[4])
{
- const GLfloat denom = plane[3] + plane[0] * x + plane[1] * y;
- if (denom == 0.0F)
- return 0.0F;
- else
- return -plane[2] / denom;
+ const GLfloat z = (plane[3] + plane[0] * x + plane[1] * y) / -plane[2];
+#if CHAN_TYPE == GL_FLOAT
+ return CLAMP(z, 0.0F, CHAN_MAXF);
+#else
+ if (z < 0)
+ return 0;
+ else if (z > CHAN_MAX)
+ return CHAN_MAX;
+ return (GLchan) lroundf(z);
+#endif
}
+static inline GLfloat
+plane_dx(const GLfloat plane[4])
+{
+ return -plane[0] / plane[2];
+}
-/*
- * Solve plane and return clamped GLchan value.
- */
-static INLINE GLchan
-solve_plane_chan(GLfloat x, GLfloat y, const GLfloat plane[4])
+static inline GLfloat
+plane_dy(const GLfloat plane[4])
{
- GLfloat z = (plane[3] + plane[0] * x + plane[1] * y) / -plane[2] + 0.5F;
- if (z < 0.0F)
- return 0;
- else if (z > CHAN_MAXF)
- return (GLchan) CHAN_MAXF;
- return (GLchan) (GLint) z;
+ return -plane[1] / plane[2];
}
compute_coveragef(const GLfloat v0[3], const GLfloat v1[3],
const GLfloat v2[3], GLint winx, GLint winy)
{
-#define B 0.125
+ /* Given a position [0,3]x[0,3] return the sub-pixel sample position.
+ * Contributed by Ray Tice.
+ *
+ * Jitter sample positions -
+ * - average should be .5 in x & y for each column
+ * - each of the 16 rows and columns should be used once
+ * - the rectangle formed by the first four points
+ * should contain the other points
+ * - the distrubition should be fairly even in any given direction
+ *
+ * The pattern drawn below isn't optimal, but it's better than a regular
+ * grid. In the drawing, the center of each subpixel is surrounded by
+ * four dots. The "x" marks the jittered position relative to the
+ * subpixel center.
+ */
+#define POS(a, b) (0.5+a*4+b)/16
static const GLfloat samples[16][2] = {
/* start with the four corners */
- { 0.00+B, 0.00+B },
- { 0.75+B, 0.00+B },
- { 0.00+B, 0.75+B },
- { 0.75+B, 0.75+B },
+ { POS(0, 2), POS(0, 0) },
+ { POS(3, 3), POS(0, 2) },
+ { POS(0, 0), POS(3, 1) },
+ { POS(3, 1), POS(3, 3) },
/* continue with interior samples */
- { 0.25+B, 0.00+B },
- { 0.50+B, 0.00+B },
- { 0.00+B, 0.25+B },
- { 0.25+B, 0.25+B },
- { 0.50+B, 0.25+B },
- { 0.75+B, 0.25+B },
- { 0.00+B, 0.50+B },
- { 0.25+B, 0.50+B },
- { 0.50+B, 0.50+B },
- { 0.75+B, 0.50+B },
- { 0.25+B, 0.75+B },
- { 0.50+B, 0.75+B }
+ { POS(1, 1), POS(0, 1) },
+ { POS(2, 0), POS(0, 3) },
+ { POS(0, 3), POS(1, 3) },
+ { POS(1, 2), POS(1, 0) },
+ { POS(2, 3), POS(1, 2) },
+ { POS(3, 2), POS(1, 1) },
+ { POS(0, 1), POS(2, 2) },
+ { POS(1, 0), POS(2, 1) },
+ { POS(2, 1), POS(2, 3) },
+ { POS(3, 0), POS(2, 0) },
+ { POS(1, 3), POS(3, 0) },
+ { POS(2, 2), POS(3, 2) }
};
+
const GLfloat x = (GLfloat) winx;
const GLfloat y = (GLfloat) winy;
const GLfloat dx0 = v1[0] - v0[0];
GLint stop = 4, i;
GLfloat insideCount = 16.0F;
-#ifdef DEBUG
- {
- const GLfloat area = dx0 * dy1 - dx1 * dy0;
- assert(area >= 0.0);
- }
-#endif
+ assert(dx0 * dy1 - dx1 * dy0 >= 0.0); /* area >= 0.0 */
for (i = 0; i < stop; i++) {
const GLfloat sx = x + samples[i][0];
const GLfloat sy = y + samples[i][1];
- const GLfloat fx0 = sx - v0[0];
- const GLfloat fy0 = sy - v0[1];
- const GLfloat fx1 = sx - v1[0];
- const GLfloat fy1 = sy - v1[1];
- const GLfloat fx2 = sx - v2[0];
- const GLfloat fy2 = sy - v2[1];
/* cross product determines if sample is inside or outside each edge */
- GLfloat cross0 = (dx0 * fy0 - dy0 * fx0);
- GLfloat cross1 = (dx1 * fy1 - dy1 * fx1);
- GLfloat cross2 = (dx2 * fy2 - dy2 * fx2);
+ GLfloat cross = (dx0 * (sy - v0[1]) - dy0 * (sx - v0[0]));
/* Check if the sample is exactly on an edge. If so, let cross be a
* positive or negative value depending on the direction of the edge.
*/
- if (cross0 == 0.0F)
- cross0 = dx0 + dy0;
- if (cross1 == 0.0F)
- cross1 = dx1 + dy1;
- if (cross2 == 0.0F)
- cross2 = dx2 + dy2;
- if (cross0 < 0.0F || cross1 < 0.0F || cross2 < 0.0F) {
- /* point is outside triangle */
+ if (cross == 0.0F)
+ cross = dx0 + dy0;
+ if (cross < 0.0F) {
+ /* sample point is outside first edge */
insideCount -= 1.0F;
stop = 16;
}
+ else {
+ /* sample point is inside first edge */
+ cross = (dx1 * (sy - v1[1]) - dy1 * (sx - v1[0]));
+ if (cross == 0.0F)
+ cross = dx1 + dy1;
+ if (cross < 0.0F) {
+ /* sample point is outside second edge */
+ insideCount -= 1.0F;
+ stop = 16;
+ }
+ else {
+ /* sample point is inside first and second edges */
+ cross = (dx2 * (sy - v2[1]) - dy2 * (sx - v2[0]));
+ if (cross == 0.0F)
+ cross = dx2 + dy2;
+ if (cross < 0.0F) {
+ /* sample point is outside third edge */
+ insideCount -= 1.0F;
+ stop = 16;
+ }
+ }
+ }
}
if (stop == 4)
return 1.0F;
-/*
- * Compute how much (area) of the given pixel is inside the triangle.
- * Vertices MUST be specified in counter-clockwise order.
- * Return: coverage in [0, 15].
- */
-static GLint
-compute_coveragei(const GLfloat v0[3], const GLfloat v1[3],
- const GLfloat v2[3], GLint winx, GLint winy)
-{
- /* NOTE: 15 samples instead of 16.
- * A better sample distribution could be used.
- */
- static const GLfloat samples[15][2] = {
- /* start with the four corners */
- { 0.00+B, 0.00+B },
- { 0.75+B, 0.00+B },
- { 0.00+B, 0.75+B },
- { 0.75+B, 0.75+B },
- /* continue with interior samples */
- { 0.25+B, 0.00+B },
- { 0.50+B, 0.00+B },
- { 0.00+B, 0.25+B },
- { 0.25+B, 0.25+B },
- { 0.50+B, 0.25+B },
- { 0.75+B, 0.25+B },
- { 0.00+B, 0.50+B },
- { 0.25+B, 0.50+B },
- /*{ 0.50, 0.50 },*/
- { 0.75+B, 0.50+B },
- { 0.25+B, 0.75+B },
- { 0.50+B, 0.75+B }
- };
- const GLfloat x = (GLfloat) winx;
- const GLfloat y = (GLfloat) winy;
- const GLfloat dx0 = v1[0] - v0[0];
- const GLfloat dy0 = v1[1] - v0[1];
- const GLfloat dx1 = v2[0] - v1[0];
- const GLfloat dy1 = v2[1] - v1[1];
- const GLfloat dx2 = v0[0] - v2[0];
- const GLfloat dy2 = v0[1] - v2[1];
- GLint stop = 4, i;
- GLint insideCount = 15;
-
-#ifdef DEBUG
- {
- const GLfloat area = dx0 * dy1 - dx1 * dy0;
- assert(area >= 0.0);
- }
-#endif
-
- for (i = 0; i < stop; i++) {
- const GLfloat sx = x + samples[i][0];
- const GLfloat sy = y + samples[i][1];
- const GLfloat fx0 = sx - v0[0];
- const GLfloat fy0 = sy - v0[1];
- const GLfloat fx1 = sx - v1[0];
- const GLfloat fy1 = sy - v1[1];
- const GLfloat fx2 = sx - v2[0];
- const GLfloat fy2 = sy - v2[1];
- /* cross product determines if sample is inside or outside each edge */
- GLfloat cross0 = (dx0 * fy0 - dy0 * fx0);
- GLfloat cross1 = (dx1 * fy1 - dy1 * fx1);
- GLfloat cross2 = (dx2 * fy2 - dy2 * fx2);
- /* Check if the sample is exactly on an edge. If so, let cross be a
- * positive or negative value depending on the direction of the edge.
- */
- if (cross0 == 0.0F)
- cross0 = dx0 + dy0;
- if (cross1 == 0.0F)
- cross1 = dx1 + dy1;
- if (cross2 == 0.0F)
- cross2 = dx2 + dy2;
- if (cross0 < 0.0F || cross1 < 0.0F || cross2 < 0.0F) {
- /* point is outside triangle */
- insideCount--;
- stop = 15;
- }
- }
- if (stop == 4)
- return 15;
- else
- return insideCount;
-}
-
-
-
static void
-rgba_aa_tri(GLcontext *ctx,
+rgba_aa_tri(struct gl_context *ctx,
const SWvertex *v0,
const SWvertex *v1,
const SWvertex *v2)
{
#define DO_Z
-#define DO_FOG
-#define DO_RGBA
-#include "s_aatritemp.h"
-}
-
-
-static void
-index_aa_tri(GLcontext *ctx,
- const SWvertex *v0,
- const SWvertex *v1,
- const SWvertex *v2)
-{
-#define DO_Z
-#define DO_FOG
-#define DO_INDEX
-#include "s_aatritemp.h"
-}
-
-
-/*
- * Compute mipmap level of detail.
- */
-static INLINE GLfloat
-compute_lambda(const GLfloat sPlane[4], const GLfloat tPlane[4],
- GLfloat invQ, GLfloat width, GLfloat height)
-{
- GLfloat dudx = sPlane[0] / sPlane[2] * invQ * width;
- GLfloat dudy = sPlane[1] / sPlane[2] * invQ * width;
- GLfloat dvdx = tPlane[0] / tPlane[2] * invQ * height;
- GLfloat dvdy = tPlane[1] / tPlane[2] * invQ * height;
- GLfloat r1 = dudx * dudx + dudy * dudy;
- GLfloat r2 = dvdx * dvdx + dvdy * dvdy;
- GLfloat rho2 = r1 + r2;
- /* return log base 2 of rho */
- if (rho2 == 0.0F)
- return 0.0;
- else
- return log(rho2) * 1.442695 * 0.5; /* 1.442695 = 1/log(2) */
-}
-
-
-static void
-tex_aa_tri(GLcontext *ctx,
- const SWvertex *v0,
- const SWvertex *v1,
- const SWvertex *v2)
-{
-#define DO_Z
-#define DO_FOG
-#define DO_RGBA
-#define DO_TEX
-#include "s_aatritemp.h"
-}
-
-
-static void
-spec_tex_aa_tri(GLcontext *ctx,
- const SWvertex *v0,
- const SWvertex *v1,
- const SWvertex *v2)
-{
-#define DO_Z
-#define DO_FOG
-#define DO_RGBA
-#define DO_TEX
-#define DO_SPEC
#include "s_aatritemp.h"
}
static void
-multitex_aa_tri(GLcontext *ctx,
- const SWvertex *v0,
- const SWvertex *v1,
- const SWvertex *v2)
+general_aa_tri(struct gl_context *ctx,
+ const SWvertex *v0,
+ const SWvertex *v1,
+ const SWvertex *v2)
{
#define DO_Z
-#define DO_FOG
-#define DO_RGBA
-#define DO_MULTITEX
+#define DO_ATTRIBS
#include "s_aatritemp.h"
}
-static void
-spec_multitex_aa_tri(GLcontext *ctx,
- const SWvertex *v0,
- const SWvertex *v1,
- const SWvertex *v2)
-{
-#define DO_Z
-#define DO_FOG
-#define DO_RGBA
-#define DO_MULTITEX
-#define DO_SPEC
-#include "s_aatritemp.h"
-}
/*
* appropriate antialiased triangle rasterizer function.
*/
void
-_mesa_set_aa_triangle_function(GLcontext *ctx)
+_swrast_set_aa_triangle_function(struct gl_context *ctx)
{
- ASSERT(ctx->Polygon.SmoothFlag);
+ SWcontext *swrast = SWRAST_CONTEXT(ctx);
- if (ctx->Texture._ReallyEnabled) {
- if (ctx->_TriangleCaps & DD_SEPARATE_SPECULAR) {
- if (ctx->Texture._ReallyEnabled > TEXTURE0_ANY) {
- SWRAST_CONTEXT(ctx)->Triangle = spec_multitex_aa_tri;
- }
- else {
- SWRAST_CONTEXT(ctx)->Triangle = spec_tex_aa_tri;
- }
- }
- else {
- if (ctx->Texture._ReallyEnabled > TEXTURE0_ANY) {
- SWRAST_CONTEXT(ctx)->Triangle = multitex_aa_tri;
- }
- else {
- SWRAST_CONTEXT(ctx)->Triangle = tex_aa_tri;
- }
- }
- }
- else if (ctx->Visual.rgbMode) {
- SWRAST_CONTEXT(ctx)->Triangle = rgba_aa_tri;
+ assert(ctx->Polygon.SmoothFlag);
+
+ if (ctx->Texture._EnabledCoordUnits != 0
+ || _swrast_use_fragment_program(ctx)
+ || swrast->_FogEnabled
+ || _mesa_need_secondary_color(ctx)) {
+ SWRAST_CONTEXT(ctx)->Triangle = general_aa_tri;
}
else {
- SWRAST_CONTEXT(ctx)->Triangle = index_aa_tri;
+ SWRAST_CONTEXT(ctx)->Triangle = rgba_aa_tri;
}
- ASSERT(SWRAST_CONTEXT(ctx)->Triangle);
+ assert(SWRAST_CONTEXT(ctx)->Triangle);
}
projects / mesa.git / blobdiff