switch (wrapMode) {
case GL_CLAMP:
/* Not exactly what the spec says, but it matches NVIDIA output */
- fcol = CLAMP(coord - 0.5F, 0.0, max-1);
+ fcol = CLAMP(coord - 0.5F, 0.0F, max - 1);
i0 = IFLOOR(fcol);
i1 = i0 + 1;
break;
}
+/**
+ * Compute slice/image to use for 1D or 2D array texture.
+ */
+static INLINE GLint
+tex_array_slice(GLfloat coord, GLsizei size)
+{
+ GLint slice = IFLOOR(coord + 0.5f);
+ slice = CLAMP(slice, 0, size - 1);
+ return slice;
+}
+
+
/**
* Compute nearest integer texcoords for given texobj and coordinate.
+ * NOTE: only used for depth texture sampling.
*/
static INLINE void
nearest_texcoord(const struct gl_texture_object *texObj,
+ GLuint level,
const GLfloat texcoord[4],
GLint *i, GLint *j, GLint *k)
{
- const GLint baseLevel = texObj->BaseLevel;
- const struct gl_texture_image *img = texObj->Image[0][baseLevel];
+ const struct gl_texture_image *img = texObj->Image[0][level];
const GLint width = img->Width;
const GLint height = img->Height;
const GLint depth = img->Depth;
break;
case GL_TEXTURE_1D_ARRAY_EXT:
*i = nearest_texel_location(texObj->WrapS, img, width, texcoord[0]);
- *j = clamp_rect_coord_nearest(texObj->WrapT, texcoord[1], height);
+ *j = tex_array_slice(texcoord[1], height);
*k = 0;
break;
case GL_TEXTURE_2D_ARRAY_EXT:
*i = nearest_texel_location(texObj->WrapS, img, width, texcoord[0]);
*j = nearest_texel_location(texObj->WrapT, img, height, texcoord[1]);
- *k = clamp_rect_coord_nearest(texObj->WrapR, texcoord[2], depth);
+ *k = tex_array_slice(texcoord[2], depth);
break;
default:
*i = *j = *k = 0;
/**
* Compute linear integer texcoords for given texobj and coordinate.
+ * NOTE: only used for depth texture sampling.
*/
static INLINE void
linear_texcoord(const struct gl_texture_object *texObj,
+ GLuint level,
const GLfloat texcoord[4],
GLint *i0, GLint *i1, GLint *j0, GLint *j1, GLint *slice,
GLfloat *wi, GLfloat *wj)
{
- const GLint baseLevel = texObj->BaseLevel;
- const struct gl_texture_image *img = texObj->Image[0][baseLevel];
+ const struct gl_texture_image *img = texObj->Image[0][level];
const GLint width = img->Width;
const GLint height = img->Height;
const GLint depth = img->Depth;
case GL_TEXTURE_1D_ARRAY_EXT:
linear_texel_locations(texObj->WrapS, img, width,
texcoord[0], i0, i1, wi);
- *j0 = clamp_rect_coord_nearest(texObj->WrapT, texcoord[1], height);
+ *j0 = tex_array_slice(texcoord[1], height);
*j1 = *j0;
*slice = 0;
break;
texcoord[0], i0, i1, wi);
linear_texel_locations(texObj->WrapT, img, height,
texcoord[1], j0, j1, wj);
- *slice = clamp_rect_coord_nearest(texObj->WrapR, texcoord[2], depth);
+ *slice = tex_array_slice(texcoord[2], depth);
break;
default:
{
switch (img->_BaseFormat) {
case GL_RGB:
- rgba[0] = tObj->BorderColor[0];
- rgba[1] = tObj->BorderColor[1];
- rgba[2] = tObj->BorderColor[2];
+ rgba[0] = tObj->BorderColor.f[0];
+ rgba[1] = tObj->BorderColor.f[1];
+ rgba[2] = tObj->BorderColor.f[2];
rgba[3] = 1.0F;
break;
case GL_ALPHA:
rgba[0] = rgba[1] = rgba[2] = 0.0;
- rgba[3] = tObj->BorderColor[3];
+ rgba[3] = tObj->BorderColor.f[3];
break;
case GL_LUMINANCE:
- rgba[0] = rgba[1] = rgba[2] = tObj->BorderColor[0];
+ rgba[0] = rgba[1] = rgba[2] = tObj->BorderColor.f[0];
rgba[3] = 1.0;
break;
case GL_LUMINANCE_ALPHA:
- rgba[0] = rgba[1] = rgba[2] = tObj->BorderColor[0];
- rgba[3] = tObj->BorderColor[3];
+ rgba[0] = rgba[1] = rgba[2] = tObj->BorderColor.f[0];
+ rgba[3] = tObj->BorderColor.f[3];
break;
case GL_INTENSITY:
- rgba[0] = rgba[1] = rgba[2] = rgba[3] = tObj->BorderColor[0];
+ rgba[0] = rgba[1] = rgba[2] = rgba[3] = tObj->BorderColor.f[0];
break;
default:
- COPY_4V(rgba, tObj->BorderColor);
+ COPY_4V(rgba, tObj->BorderColor.f);
}
}
}
-
/**********************************************************************/
/* 2D Texture Array Sampling Functions */
/**********************************************************************/
i = nearest_texel_location(tObj->WrapS, img, width, texcoord[0]);
j = nearest_texel_location(tObj->WrapT, img, height, texcoord[1]);
- array = clamp_rect_coord_nearest(tObj->WrapR, texcoord[2], depth);
+ array = tex_array_slice(texcoord[2], depth);
if (i < 0 || i >= (GLint) img->Width ||
j < 0 || j >= (GLint) img->Height ||
linear_texel_locations(tObj->WrapS, img, width, texcoord[0], &i0, &i1, &a);
linear_texel_locations(tObj->WrapT, img, height, texcoord[1], &j0, &j1, &b);
- array = clamp_rect_coord_nearest(tObj->WrapR, texcoord[2], depth);
+ array = tex_array_slice(texcoord[2], depth);
if (array < 0 || array >= depth) {
- COPY_4V(rgba, tObj->BorderColor);
+ COPY_4V(rgba, tObj->BorderColor.f);
}
else {
if (img->Border) {
(void) ctx;
i = nearest_texel_location(tObj->WrapS, img, width, texcoord[0]);
- array = clamp_rect_coord_nearest(tObj->WrapT, texcoord[1], height);
+ array = tex_array_slice(texcoord[1], height);
if (i < 0 || i >= (GLint) img->Width ||
array < 0 || array >= (GLint) img->Height) {
GLfloat t0[4], t1[4];
linear_texel_locations(tObj->WrapS, img, width, texcoord[0], &i0, &i1, &a);
- array = clamp_rect_coord_nearest(tObj->WrapT, texcoord[1], height);
+ array = tex_array_slice(texcoord[1], height);
if (img->Border) {
i0 += img->Border;
/**
- * Sample a shadow/depth texture.
+ * Choose the mipmap level to use when sampling from a depth texture.
+ */
+static int
+choose_depth_texture_level(const struct gl_texture_object *tObj, GLfloat lambda)
+{
+ GLint level;
+
+ lambda = CLAMP(lambda, tObj->MinLod, tObj->MaxLod);
+
+ level = (GLint) lambda;
+
+ level = CLAMP(level, tObj->BaseLevel, tObj->_MaxLevel);
+
+ return level;
+}
+
+
+/**
+ * Sample a shadow/depth texture. This function is incomplete. It doesn't
+ * check for minification vs. magnification, etc.
*/
static void
sample_depth_texture( GLcontext *ctx,
const GLfloat texcoords[][4], const GLfloat lambda[],
GLfloat texel[][4] )
{
- const GLint baseLevel = tObj->BaseLevel;
- const struct gl_texture_image *img = tObj->Image[0][baseLevel];
+ const GLint level = choose_depth_texture_level(tObj, lambda[0]);
+ const struct gl_texture_image *img = tObj->Image[0][level];
const GLint width = img->Width;
const GLint height = img->Height;
const GLint depth = img->Depth;
GLenum function;
GLfloat result;
- (void) lambda;
-
ASSERT(img->_BaseFormat == GL_DEPTH_COMPONENT ||
img->_BaseFormat == GL_DEPTH_STENCIL_EXT);
GLfloat depthSample;
GLint col, row, slice;
- nearest_texcoord(tObj, texcoords[i], &col, &row, &slice);
+ nearest_texcoord(tObj, level, texcoords[i], &col, &row, &slice);
if (col >= 0 && row >= 0 && col < width && row < height &&
slice >= 0 && slice < depth) {
img->FetchTexelf(img, col, row, slice, &depthSample);
}
else {
- depthSample = tObj->BorderColor[0];
+ depthSample = tObj->BorderColor.f[0];
}
result = shadow_compare(function, texcoords[i][compare_coord],
GLfloat wi, wj;
GLuint useBorderTexel;
- linear_texcoord(tObj, texcoords[i], &i0, &i1, &j0, &j1, &slice,
+ linear_texcoord(tObj, level, texcoords[i], &i0, &i1, &j0, &j1, &slice,
&wi, &wj);
useBorderTexel = 0;
}
if (slice < 0 || slice >= (GLint) depth) {
- depth00 = tObj->BorderColor[0];
- depth01 = tObj->BorderColor[0];
- depth10 = tObj->BorderColor[0];
- depth11 = tObj->BorderColor[0];
+ depth00 = tObj->BorderColor.f[0];
+ depth01 = tObj->BorderColor.f[0];
+ depth10 = tObj->BorderColor.f[0];
+ depth11 = tObj->BorderColor.f[0];
}
else {
/* get four depth samples from the texture */
if (useBorderTexel & (I0BIT | J0BIT)) {
- depth00 = tObj->BorderColor[0];
+ depth00 = tObj->BorderColor.f[0];
}
else {
img->FetchTexelf(img, i0, j0, slice, &depth00);
}
if (useBorderTexel & (I1BIT | J0BIT)) {
- depth10 = tObj->BorderColor[0];
+ depth10 = tObj->BorderColor.f[0];
}
else {
img->FetchTexelf(img, i1, j0, slice, &depth10);
if (tObj->Target != GL_TEXTURE_1D_ARRAY_EXT) {
if (useBorderTexel & (I0BIT | J1BIT)) {
- depth01 = tObj->BorderColor[0];
+ depth01 = tObj->BorderColor.f[0];
}
else {
img->FetchTexelf(img, i0, j1, slice, &depth01);
}
if (useBorderTexel & (I1BIT | J1BIT)) {
- depth11 = tObj->BorderColor[0];
+ depth11 = tObj->BorderColor.f[0];
}
else {
img->FetchTexelf(img, i1, j1, slice, &depth11);
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