/**************************************************************************
*
- * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
+ * Copyright 2010, VMware Inc.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* 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
+ * IN NO EVENT SHALL VMWARE 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.
*/
#include "lp_setup_context.h"
+#include "util/u_math.h"
+#include "util/u_memory.h"
+#include "lp_perf.h"
+#include "lp_setup_context.h"
+#include "lp_rast.h"
+#include "lp_state_fs.h"
+
+#define NUM_CHANNELS 4
+
+struct point_info {
+ /* x,y deltas */
+ int dy01, dy12;
+ int dx01, dx12;
+
+ const float (*v0)[4];
+};
+
+
+/**
+ * Compute a0 for a constant-valued coefficient (GL_FLAT shading).
+ */
+static void constant_coef( struct lp_setup_context *setup,
+ struct lp_rast_triangle *point,
+ unsigned slot,
+ const float value,
+ unsigned i )
+{
+ point->inputs.a0[slot][i] = value;
+ point->inputs.dadx[slot][i] = 0.0f;
+ point->inputs.dady[slot][i] = 0.0f;
+}
+
+/**
+ * Special coefficient setup for gl_FragCoord.
+ * X and Y are trivial
+ * Z and W are copied from position_coef which should have already been computed.
+ * We could do a bit less work if we'd examine gl_FragCoord's swizzle mask.
+ */
+static void
+setup_point_fragcoord_coef(struct lp_setup_context *setup,
+ struct lp_rast_triangle *point,
+ const struct point_info *info,
+ unsigned slot,
+ unsigned usage_mask)
+{
+ /*X*/
+ if (usage_mask & TGSI_WRITEMASK_X) {
+ point->inputs.a0[slot][0] = 0.0;
+ point->inputs.dadx[slot][0] = 1.0;
+ point->inputs.dady[slot][0] = 0.0;
+ }
+
+ /*Y*/
+ if (usage_mask & TGSI_WRITEMASK_Y) {
+ point->inputs.a0[slot][1] = 0.0;
+ point->inputs.dadx[slot][1] = 0.0;
+ point->inputs.dady[slot][1] = 1.0;
+ }
+
+ /*Z*/
+ if (usage_mask & TGSI_WRITEMASK_Z) {
+ constant_coef(setup, point, slot, info->v0[0][2], 2);
+ }
+
+ /*W*/
+ if (usage_mask & TGSI_WRITEMASK_W) {
+ constant_coef(setup, point, slot, info->v0[0][3], 3);
+ }
+}
+
+/**
+ * Compute the point->coef[] array dadx, dady, a0 values.
+ */
+static void
+setup_point_coefficients( struct lp_setup_context *setup,
+ struct lp_rast_triangle *point,
+ const struct point_info *info)
+{
+ unsigned fragcoord_usage_mask = TGSI_WRITEMASK_XYZ;
+ unsigned slot;
+
+ /* setup interpolation for all the remaining attributes:
+ */
+ for (slot = 0; slot < setup->fs.nr_inputs; slot++) {
+ unsigned vert_attr = setup->fs.input[slot].src_index;
+ unsigned usage_mask = setup->fs.input[slot].usage_mask;
+ unsigned i;
+
+ switch (setup->fs.input[slot].interp) {
+ case LP_INTERP_POSITION:
+ /*
+ * The generated pixel interpolators will pick up the coeffs from
+ * slot 0, so all need to ensure that the usage mask is covers all
+ * usages.
+ */
+ fragcoord_usage_mask |= usage_mask;
+ break;
+
+ default:
+ for (i = 0; i < NUM_CHANNELS; i++) {
+ if (usage_mask & (1 << i))
+ constant_coef(setup, point, slot+1, info->v0[vert_attr][i], i);
+ }
+ }
+ }
+
+ /* The internal position input is in slot zero:
+ */
+ setup_point_fragcoord_coef(setup, point, info, 0,
+ fragcoord_usage_mask);
+}
+
+static INLINE int
+subpixel_snap(float a)
+{
+ return util_iround(FIXED_ONE * a);
+}
+
static void lp_setup_point( struct lp_setup_context *setup,
- const float (*v0)[4] )
+ const float (*v0)[4] )
{
+ /* x/y positions in fixed point */
+ const int sizeAttr = setup->psize;
+ const float size
+ = sizeAttr > 0 ? v0[sizeAttr][0]
+ : setup->point_size;
+ const float half_width = 0.5F * size;
+
+ const int x0 = subpixel_snap(v0[0][0] - half_width - setup->pixel_offset);
+ const int x1 = subpixel_snap(v0[0][0] - half_width - setup->pixel_offset);
+ const int x2 = subpixel_snap(v0[0][0] + half_width - setup->pixel_offset);
+ const int y0 = subpixel_snap(v0[0][1] - half_width - setup->pixel_offset);
+ const int y1 = subpixel_snap(v0[0][1] + half_width - setup->pixel_offset);
+ const int y2 = subpixel_snap(v0[0][1] + half_width - setup->pixel_offset);
+ struct lp_scene *scene = lp_setup_get_current_scene(setup);
+ struct lp_rast_triangle *point;
+ unsigned bytes;
+ struct u_rect bbox;
+ unsigned nr_planes = 4;
+ struct point_info info;
+
+
+ /* Bounding rectangle (in pixels) */
+ {
+ /* Yes this is necessary to accurately calculate bounding boxes
+ * with the two fill-conventions we support. GL (normally) ends
+ * up needing a bottom-left fill convention, which requires
+ * slightly different rounding.
+ */
+ int adj = (setup->pixel_offset != 0) ? 1 : 0;
+
+ bbox.x0 = (MIN3(x0, x1, x2) + (FIXED_ONE-1)) >> FIXED_ORDER;
+ bbox.x1 = (MAX3(x0, x1, x2) + (FIXED_ONE-1)) >> FIXED_ORDER;
+ bbox.y0 = (MIN3(y0, y1, y2) + (FIXED_ONE-1) + adj) >> FIXED_ORDER;
+ bbox.y1 = (MAX3(y0, y1, y2) + (FIXED_ONE-1) + adj) >> FIXED_ORDER;
+
+ /* Inclusive coordinates:
+ */
+ bbox.x1--;
+ bbox.y1--;
+ }
+
+ if (!u_rect_test_intersection(&setup->draw_region, &bbox)) {
+ if (0) debug_printf("offscreen\n");
+ LP_COUNT(nr_culled_tris);
+ return;
+ }
+
+ u_rect_find_intersection(&setup->draw_region, &bbox);
+
+ point = lp_setup_alloc_triangle(scene,
+ setup->fs.nr_inputs,
+ nr_planes,
+ &bytes);
+ if (!point)
+ return;
+
+#ifdef DEBUG
+ point->v[0][0] = v0[0][0];
+ point->v[0][1] = v0[0][1];
+#endif
+
+ info.v0 = v0;
+ info.dx01 = x1 - x0;
+ info.dx12 = x2 - x1;
+ info.dy01 = y1 - y0;
+ info.dy12 = y2 - y1;
+
+ /* Setup parameter interpolants:
+ */
+ setup_point_coefficients(setup, point, &info);
+
+ point->inputs.facing = 1.0F;
+ point->inputs.state = setup->fs.stored;
+
+ {
+ point->plane[0].dcdx = -1;
+ point->plane[0].dcdy = 0;
+ point->plane[0].c = 1-bbox.x0;
+ point->plane[0].ei = 0;
+ point->plane[0].eo = 1;
+
+ point->plane[1].dcdx = 1;
+ point->plane[1].dcdy = 0;
+ point->plane[1].c = bbox.x1+1;
+ point->plane[1].ei = -1;
+ point->plane[1].eo = 0;
+
+ point->plane[2].dcdx = 0;
+ point->plane[2].dcdy = 1;
+ point->plane[2].c = 1-bbox.y0;
+ point->plane[2].ei = 0;
+ point->plane[2].eo = 1;
+
+ point->plane[3].dcdx = 0;
+ point->plane[3].dcdy = -1;
+ point->plane[3].c = bbox.y1+1;
+ point->plane[3].ei = -1;
+ point->plane[3].eo = 0;
+ }
+
+ lp_setup_bin_triangle(setup, point, &bbox, nr_planes);
}
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