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authorBrian <brian@yutani.localnet.net>2007-04-14 09:33:20 -0600
committerBrian <brian@yutani.localnet.net>2007-04-14 09:33:20 -0600
commitfde15a2bae2f2ca552763705f12d53e4606feabf (patch)
treef4f9022bbd58eb1a29cab1ce93a215ca009d9dab /src/mesa
parent216eb81c53908c9ac774a378425691aa66205a88 (diff)
Fix sample_depth_texture() to handle texture rectangle coords.
Diffstat (limited to 'src/mesa')
-rw-r--r--src/mesa/swrast/s_texfilter.c115
1 files changed, 85 insertions, 30 deletions
diff --git a/src/mesa/swrast/s_texfilter.c b/src/mesa/swrast/s_texfilter.c
index b2c5574d95..5413fc0410 100644
--- a/src/mesa/swrast/s_texfilter.c
+++ b/src/mesa/swrast/s_texfilter.c
@@ -1,8 +1,8 @@
/*
* Mesa 3-D graphics library
- * Version: 6.5.2
+ * Version: 6.5.3
*
- * Copyright (C) 1999-2006 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"),
@@ -2026,6 +2026,60 @@ sample_lambda_cube( GLcontext *ctx,
/* Texture Rectangle Sampling Functions */
/**********************************************************************/
+
+/**
+ * Do clamp/wrap for a texture rectangle coord, GL_NEAREST filter mode.
+ */
+static INLINE GLint
+clamp_rect_coord_nearest(GLenum wrapMode, GLfloat coord, GLint max)
+{
+ if (wrapMode == GL_CLAMP) {
+ return IFLOOR( CLAMP(coord, 0.0F, max - 1) );
+ }
+ else if (wrapMode == GL_CLAMP_TO_EDGE) {
+ return IFLOOR( CLAMP(coord, 0.5F, max - 0.5F) );
+ }
+ else {
+ return IFLOOR( CLAMP(coord, -0.5F, max + 0.5F) );
+ }
+}
+
+
+/*
+ * As above, but GL_LINEAR filtering.
+ */
+static INLINE void
+clamp_rect_coord_linear(GLenum wrapMode, GLfloat coord, GLint max,
+ GLint *i0out, GLint *i1out)
+{
+ GLfloat fcol;
+ GLint i0, i1;
+ if (wrapMode == GL_CLAMP) {
+ /* Not exactly what the spec says, but it matches NVIDIA output */
+ fcol = CLAMP(coord - 0.5F, 0.0, max-1);
+ i0 = IFLOOR(fcol);
+ i1 = i0 + 1;
+ }
+ else if (wrapMode == GL_CLAMP_TO_EDGE) {
+ fcol = CLAMP(coord, 0.5F, max - 0.5F);
+ fcol -= 0.5F;
+ i0 = IFLOOR(fcol);
+ i1 = i0 + 1;
+ if (i1 > max - 1)
+ i1 = max - 1;
+ }
+ else {
+ ASSERT(wrapMode == GL_CLAMP_TO_BORDER);
+ fcol = CLAMP(coord, -0.5F, max + 0.5F);
+ fcol -= 0.5F;
+ i0 = IFLOOR(fcol);
+ i1 = i0 + 1;
+ }
+ *i0out = i0;
+ *i1out = i1;
+}
+
+
static void
sample_nearest_rect(GLcontext *ctx,
const struct gl_texture_object *tObj, GLuint n,
@@ -2050,29 +2104,10 @@ sample_nearest_rect(GLcontext *ctx,
tObj->WrapT == GL_CLAMP_TO_BORDER);
ASSERT(img->_BaseFormat != GL_COLOR_INDEX);
- /* XXX move Wrap mode tests outside of loops for common cases */
for (i = 0; i < n; i++) {
GLint row, col;
- /* NOTE: we DO NOT use [0, 1] texture coordinates! */
- if (tObj->WrapS == GL_CLAMP) {
- col = IFLOOR( CLAMP(texcoords[i][0], 0.0F, width - 1) );
- }
- else if (tObj->WrapS == GL_CLAMP_TO_EDGE) {
- col = IFLOOR( CLAMP(texcoords[i][0], 0.5F, width - 0.5F) );
- }
- else {
- col = IFLOOR( CLAMP(texcoords[i][0], -0.5F, width + 0.5F) );
- }
- if (tObj->WrapT == GL_CLAMP) {
- row = IFLOOR( CLAMP(texcoords[i][1], 0.0F, height - 1) );
- }
- else if (tObj->WrapT == GL_CLAMP_TO_EDGE) {
- row = IFLOOR( CLAMP(texcoords[i][1], 0.5F, height - 0.5F) );
- }
- else {
- row = IFLOOR( CLAMP(texcoords[i][1], -0.5F, height + 0.5F) );
- }
-
+ col = clamp_rect_coord_nearest(tObj->WrapS, texcoords[i][0], width);
+ row = clamp_rect_coord_nearest(tObj->WrapT, texcoords[i][1], height);
if (col < 0 || col > width_minus_1 || row < 0 || row > height_minus_1)
COPY_CHAN4(rgba[i], tObj->_BorderChan);
else
@@ -2286,9 +2321,17 @@ sample_depth_texture( GLcontext *ctx,
for (i = 0; i < n; i++) {
GLfloat depthSample;
GLint col, row;
- /* XXX fix for texture rectangle! */
- COMPUTE_NEAREST_TEXEL_LOCATION(tObj->WrapS, texcoords[i][0], width, col);
- COMPUTE_NEAREST_TEXEL_LOCATION(tObj->WrapT, texcoords[i][1], height, row);
+
+ if (tObj->Target == GL_TEXTURE_RECTANGLE_ARB) {
+ col = clamp_rect_coord_nearest(tObj->WrapS, texcoords[i][0], width);
+ row = clamp_rect_coord_nearest(tObj->WrapT, texcoords[i][1], height);
+ }
+ else {
+ COMPUTE_NEAREST_TEXEL_LOCATION(tObj->WrapS, texcoords[i][0],
+ width, col);
+ COMPUTE_NEAREST_TEXEL_LOCATION(tObj->WrapT, texcoords[i][1],
+ height, row);
+ }
if (col >= 0 && row >= 0 && col < width && row < height) {
img->FetchTexelf(img, col, row, 0, &depthSample);
}
@@ -2362,9 +2405,18 @@ sample_depth_texture( GLcontext *ctx,
GLfloat u, v;
GLuint useBorderTexel;
- /* XXX fix for texture rectangle! */
- COMPUTE_LINEAR_TEXEL_LOCATIONS(tObj->WrapS, texcoords[i][0], u, width, i0, i1);
- COMPUTE_LINEAR_TEXEL_LOCATIONS(tObj->WrapT, texcoords[i][1], v, height,j0, j1);
+ if (tObj->Target == GL_TEXTURE_RECTANGLE_ARB) {
+ clamp_rect_coord_linear(tObj->WrapS, texcoords[i][0],
+ width, &i0, &i1);
+ clamp_rect_coord_linear(tObj->WrapT, texcoords[i][1],
+ height, &j0, &j1);
+ }
+ else {
+ COMPUTE_LINEAR_TEXEL_LOCATIONS(tObj->WrapS, texcoords[i][0],
+ u, width, i0, i1);
+ COMPUTE_LINEAR_TEXEL_LOCATIONS(tObj->WrapT, texcoords[i][1],
+ v, height,j0, j1);
+ }
useBorderTexel = 0;
if (img->Border) {
@@ -2727,7 +2779,10 @@ _swrast_choose_texture_sample_func( GLcontext *ctx,
return &sample_nearest_cube;
}
case GL_TEXTURE_RECTANGLE_NV:
- if (needLambda) {
+ if (format == GL_DEPTH_COMPONENT || format == GL_DEPTH_STENCIL_EXT) {
+ return &sample_depth_texture;
+ }
+ else if (needLambda) {
return &sample_lambda_rect;
}
else if (t->MinFilter == GL_LINEAR) {