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authorBrian Paul <brian.paul@tungstengraphics.com>2003-07-03 03:05:48 +0000
committerBrian Paul <brian.paul@tungstengraphics.com>2003-07-03 03:05:48 +0000
commit887e2cf01a99f7fe1b7c94320b7bdbbf0d6ad2f8 (patch)
tree0db71a71d77fc7130d080e2435cddf22f7f8fea3 /src/mesa/swrast/s_texture.c
parent32bac60519dab482cd3f44355563750a4521f4cb (diff)
Implemented GL_ARB_texture_non_power_of_two (except for auto mipmap generation).
Diffstat (limited to 'src/mesa/swrast/s_texture.c')
-rw-r--r--src/mesa/swrast/s_texture.c56
1 files changed, 44 insertions, 12 deletions
diff --git a/src/mesa/swrast/s_texture.c b/src/mesa/swrast/s_texture.c
index a47e6a72ae..1343b289fb 100644
--- a/src/mesa/swrast/s_texture.c
+++ b/src/mesa/swrast/s_texture.c
@@ -44,6 +44,20 @@
/*
+ * Compute the remainder of a divided by b, but be careful with
+ * negative values so that GL_REPEAT mode works right.
+ */
+static INLINE GLint
+repeat_remainder(GLint a, GLint b)
+{
+ if (a >= 0)
+ return a % b;
+ else
+ return (a + 1) % b + b - 1;
+}
+
+
+/*
* Used to compute texel locations for linear sampling.
* Input:
* wrapMode = GL_REPEAT, GL_CLAMP, GL_CLAMP_TO_EDGE, GL_CLAMP_TO_BORDER
@@ -57,8 +71,14 @@
{ \
if (wrapMode == GL_REPEAT) { \
U = S * SIZE - 0.5F; \
- I0 = IFLOOR(U) & (SIZE - 1); \
- I1 = (I0 + 1) & (SIZE - 1); \
+ if (tObj->_IsPowerOfTwo) { \
+ I0 = IFLOOR(U) & (SIZE - 1); \
+ I1 = (I0 + 1) & (SIZE - 1); \
+ } \
+ else { \
+ I0 = repeat_remainder(IFLOOR(U), SIZE); \
+ I1 = repeat_remainder(I0 + 1, SIZE); \
+ } \
} \
else if (wrapMode == GL_CLAMP_TO_EDGE) { \
if (S <= 0.0F) \
@@ -75,7 +95,7 @@
if (I1 >= (GLint) SIZE) \
I1 = SIZE - 1; \
} \
- else if (wrapMode == GL_CLAMP_TO_BORDER) { \
+ else if (wrapMode == GL_CLAMP_TO_BORDER) { \
const GLfloat min = -1.0F / (2.0F * SIZE); \
const GLfloat max = 1.0F - min; \
if (S <= min) \
@@ -88,7 +108,7 @@
I0 = IFLOOR(U); \
I1 = I0 + 1; \
} \
- else if (wrapMode == GL_MIRRORED_REPEAT) { \
+ else if (wrapMode == GL_MIRRORED_REPEAT) { \
const GLint flr = IFLOOR(S); \
if (flr & 1) \
U = 1.0F - (S - (GLfloat) flr); /* flr is odd */ \
@@ -150,7 +170,10 @@
/* s limited to [0,1) */ \
/* i limited to [0,size-1] */ \
I = IFLOOR(S * SIZE); \
- I &= (SIZE - 1); \
+ if (tObj->_IsPowerOfTwo) \
+ I &= (SIZE - 1); \
+ else \
+ I = repeat_remainder(I, SIZE); \
} \
else if (wrapMode == GL_CLAMP_TO_EDGE) { \
/* s limited to [min,max] */ \
@@ -164,7 +187,7 @@
else \
I = IFLOOR(S * SIZE); \
} \
- else if (wrapMode == GL_CLAMP_TO_BORDER) { \
+ else if (wrapMode == GL_CLAMP_TO_BORDER) { \
/* s limited to [min,max] */ \
/* i limited to [-1, size] */ \
const GLfloat min = -1.0F / (2.0F * SIZE); \
@@ -176,7 +199,7 @@
else \
I = IFLOOR(S * SIZE); \
} \
- else if (wrapMode == GL_MIRRORED_REPEAT) { \
+ else if (wrapMode == GL_MIRRORED_REPEAT) { \
const GLfloat min = 1.0F / (2.0F * SIZE); \
const GLfloat max = 1.0F - min; \
const GLint flr = IFLOOR(S); \
@@ -230,6 +253,7 @@
}
+/* Power of two image sizes only */
#define COMPUTE_LINEAR_REPEAT_TEXEL_LOCATION(S, U, SIZE, I0, I1) \
{ \
U = S * SIZE - 0.5F; \
@@ -1215,6 +1239,7 @@ sample_2d_linear_repeat(GLcontext *ctx,
ASSERT(tObj->WrapT == GL_REPEAT);
ASSERT(img->Border == 0);
ASSERT(img->Format != GL_COLOR_INDEX);
+ ASSERT(img->_IsPowerOfTwo);
COMPUTE_LINEAR_REPEAT_TEXEL_LOCATION(texcoord[0], u, width, i0, i1);
COMPUTE_LINEAR_REPEAT_TEXEL_LOCATION(texcoord[1], v, height, j0, j1);
@@ -1379,6 +1404,7 @@ sample_2d_linear_mipmap_linear_repeat( GLcontext *ctx,
ASSERT(lambda != NULL);
ASSERT(tObj->WrapS == GL_REPEAT);
ASSERT(tObj->WrapT == GL_REPEAT);
+ ASSERT(tObj->_IsPowerOfTwo);
for (i = 0; i < n; i++) {
GLint level;
COMPUTE_LINEAR_MIPMAP_LEVEL(tObj, lambda[i], level);
@@ -1457,6 +1483,7 @@ opt_sample_rgb_2d( GLcontext *ctx, GLuint texUnit,
ASSERT(tObj->WrapT==GL_REPEAT);
ASSERT(img->Border==0);
ASSERT(img->Format==GL_RGB);
+ ASSERT(img->_IsPowerOfTwo);
for (k=0; k<n; k++) {
GLint i = IFLOOR(texcoords[k][0] * width) & colMask;
@@ -1496,6 +1523,7 @@ opt_sample_rgba_2d( GLcontext *ctx, GLuint texUnit,
ASSERT(tObj->WrapT==GL_REPEAT);
ASSERT(img->Border==0);
ASSERT(img->Format==GL_RGBA);
+ ASSERT(img->_IsPowerOfTwo);
for (i = 0; i < n; i++) {
const GLint col = IFLOOR(texcoords[i][0] * width) & colMask;
@@ -1521,10 +1549,11 @@ sample_lambda_2d( GLcontext *ctx, GLuint texUnit,
GLuint minStart, minEnd; /* texels with minification */
GLuint magStart, magEnd; /* texels with magnification */
- const GLboolean repeatNoBorder = (tObj->WrapS == GL_REPEAT)
+ const GLboolean repeatNoBorderPOT = (tObj->WrapS == GL_REPEAT)
&& (tObj->WrapT == GL_REPEAT)
&& (tImg->Border == 0 && (tImg->Width == tImg->RowStride))
- && (tImg->Format != GL_COLOR_INDEX);
+ && (tImg->Format != GL_COLOR_INDEX)
+ && tImg->_IsPowerOfTwo;
ASSERT(lambda != NULL);
compute_min_mag_ranges(SWRAST_CONTEXT(ctx)->_MinMagThresh[texUnit],
@@ -1535,7 +1564,7 @@ sample_lambda_2d( GLcontext *ctx, GLuint texUnit,
const GLuint m = minEnd - minStart;
switch (tObj->MinFilter) {
case GL_NEAREST:
- if (repeatNoBorder) {
+ if (repeatNoBorderPOT) {
switch (tImg->Format) {
case GL_RGB:
opt_sample_rgb_2d(ctx, texUnit, tObj, m, texcoords + minStart,
@@ -1573,7 +1602,7 @@ sample_lambda_2d( GLcontext *ctx, GLuint texUnit,
lambda + minStart, rgba + minStart);
break;
case GL_LINEAR_MIPMAP_LINEAR:
- if (repeatNoBorder)
+ if (repeatNoBorderPOT)
sample_2d_linear_mipmap_linear_repeat(ctx, tObj, m,
texcoords + minStart, lambda + minStart, rgba + minStart);
else
@@ -1592,7 +1621,7 @@ sample_lambda_2d( GLcontext *ctx, GLuint texUnit,
switch (tObj->MagFilter) {
case GL_NEAREST:
- if (repeatNoBorder) {
+ if (repeatNoBorderPOT) {
switch (tImg->Format) {
case GL_RGB:
opt_sample_rgb_2d(ctx, texUnit, tObj, m, texcoords + magStart,
@@ -2977,12 +3006,14 @@ _swrast_choose_texture_sample_func( GLcontext *ctx,
ASSERT(t->MinFilter == GL_NEAREST);
if (t->WrapS == GL_REPEAT &&
t->WrapT == GL_REPEAT &&
+ t->_IsPowerOfTwo &&
t->Image[baseLevel]->Border == 0 &&
t->Image[baseLevel]->TexFormat->MesaFormat == MESA_FORMAT_RGB) {
return &opt_sample_rgb_2d;
}
else if (t->WrapS == GL_REPEAT &&
t->WrapT == GL_REPEAT &&
+ t->_IsPowerOfTwo &&
t->Image[baseLevel]->Border == 0 &&
t->Image[baseLevel]->TexFormat->MesaFormat == MESA_FORMAT_RGBA) {
return &opt_sample_rgba_2d;
@@ -4188,6 +4219,7 @@ _swrast_texture_span( GLcontext *ctx, struct sw_span *span )
swrast->TextureSample[unit]( ctx, unit, texUnit->_Current, span->end,
(const GLfloat (*)[4]) span->array->texcoords[unit],
lambda, texels );
+
/* GL_SGI_texture_color_table */
if (texUnit->ColorTableEnabled) {
_swrast_texture_table_lookup(&texUnit->ColorTable, span->end, texels);