[Mesa-dev] [PATCH 7/7] mesa: Fill out ARB_texture_view entry points
Courtney Goeltzenleuchter
courtney at lunarg.com
Tue Nov 5 14:59:49 PST 2013
Add Mesa TextureView logic.
Incorporate feedback on ARB_texture_view
---
src/mesa/main/texstorage.c | 3 +-
src/mesa/main/textureview.c | 558 +++++++++++++++++++++++++++++++++++++++++++-
2 files changed, 558 insertions(+), 3 deletions(-)
diff --git a/src/mesa/main/texstorage.c b/src/mesa/main/texstorage.c
index 4da3c91..8519bb8 100644
--- a/src/mesa/main/texstorage.c
+++ b/src/mesa/main/texstorage.c
@@ -454,8 +454,7 @@ texstorage(GLuint dims, GLenum target, GLsizei levels, GLenum internalformat,
texObj->NumLevels = levels;
texObj->MinLayer = 0;
texObj->NumLayers = 1;
- switch (target)
- {
+ switch (target) {
case GL_TEXTURE_1D_ARRAY:
texObj->NumLayers = height;
break;
diff --git a/src/mesa/main/textureview.c b/src/mesa/main/textureview.c
index 4a6bd62..a30598d 100644
--- a/src/mesa/main/textureview.c
+++ b/src/mesa/main/textureview.c
@@ -42,6 +42,340 @@
#include "textureview.h"
#include "mtypes.h"
+/* Table 3.X.2 (Compatible internal formats for TextureView)
+ ---------------------------------------------------------------------------
+ | Class | Internal formats |
+ ---------------------------------------------------------------------------
+ | VIEW_CLASS_128_BITS | RGBA32F, RGBA32UI, RGBA32I |
+ ---------------------------------------------------------------------------
+ | VIEW_CLASS_96_BITS | RGB32F, RGB32UI, RGB32I |
+ ---------------------------------------------------------------------------
+ | VIEW_CLASS_64_BITS | RGBA16F, RG32F, RGBA16UI, RG32UI, RGBA16I, |
+ | | RG32I, RGBA16, RGBA16_SNORM |
+ ---------------------------------------------------------------------------
+ | VIEW_CLASS_48_BITS | RGB16, RGB16_SNORM, RGB16F, RGB16UI, RGB16I |
+ ---------------------------------------------------------------------------
+ | VIEW_CLASS_32_BITS | RG16F, R11F_G11F_B10F, R32F, |
+ | | RGB10_A2UI, RGBA8UI, RG16UI, R32UI, |
+ | | RGBA8I, RG16I, R32I, RGB10_A2, RGBA8, RG16, |
+ | | RGBA8_SNORM, RG16_SNORM, SRGB8_ALPHA8, RGB9_E5 |
+ ---------------------------------------------------------------------------
+ | VIEW_CLASS_24_BITS | RGB8, RGB8_SNORM, SRGB8, RGB8UI, RGB8I |
+ ---------------------------------------------------------------------------
+ | VIEW_CLASS_16_BITS | R16F, RG8UI, R16UI, RG8I, R16I, RG8, R16, |
+ | | RG8_SNORM, R16_SNORM |
+ ---------------------------------------------------------------------------
+ | VIEW_CLASS_8_BITS | R8UI, R8I, R8, R8_SNORM |
+ ---------------------------------------------------------------------------
+ | VIEW_CLASS_RGTC1_RED | COMPRESSED_RED_RGTC1, |
+ | | COMPRESSED_SIGNED_RED_RGTC1 |
+ ---------------------------------------------------------------------------
+ | VIEW_CLASS_RGTC2_RG | COMPRESSED_RG_RGTC2, |
+ | | COMPRESSED_SIGNED_RG_RGTC2 |
+ ---------------------------------------------------------------------------
+ | VIEW_CLASS_BPTC_UNORM | COMPRESSED_RGBA_BPTC_UNORM, |
+ | | COMPRESSED_SRGB_ALPHA_BPTC_UNORM |
+ ---------------------------------------------------------------------------
+ | VIEW_CLASS_BPTC_FLOAT | COMPRESSED_RGB_BPTC_SIGNED_FLOAT, |
+ | | COMPRESSED_RGB_BPTC_UNSIGNED_FLOAT |
+ ---------------------------------------------------------------------------
+ */
+struct internal_format_class_info {
+ GLenum view_class;
+ GLenum internal_format;
+};
+#define INFO(c,f) {GL_##c, GL_##f}
+static const struct internal_format_class_info _compatible_internal_formats[] = {
+ INFO(VIEW_CLASS_128_BITS, RGBA32F),
+ INFO(VIEW_CLASS_128_BITS, RGBA32UI),
+ INFO(VIEW_CLASS_128_BITS, RGBA32I),
+ INFO(VIEW_CLASS_96_BITS, RGB32F),
+ INFO(VIEW_CLASS_96_BITS, RGB32UI),
+ INFO(VIEW_CLASS_96_BITS, RGB32I),
+ INFO(VIEW_CLASS_64_BITS, RGBA16F),
+ INFO(VIEW_CLASS_64_BITS, RG32F),
+ INFO(VIEW_CLASS_64_BITS, RGBA16UI),
+ INFO(VIEW_CLASS_64_BITS, RG32UI),
+ INFO(VIEW_CLASS_64_BITS, RGBA16I),
+ INFO(VIEW_CLASS_64_BITS, RG32I),
+ INFO(VIEW_CLASS_64_BITS, RGBA16),
+ INFO(VIEW_CLASS_64_BITS, RGBA16_SNORM),
+ INFO(VIEW_CLASS_48_BITS, RGB16),
+ INFO(VIEW_CLASS_48_BITS, RGB16_SNORM),
+ INFO(VIEW_CLASS_48_BITS, RGB16F),
+ INFO(VIEW_CLASS_48_BITS, RGB16UI),
+ INFO(VIEW_CLASS_48_BITS, RGB16I),
+ INFO(VIEW_CLASS_32_BITS, RG16F),
+ INFO(VIEW_CLASS_32_BITS, R11F_G11F_B10F),
+ INFO(VIEW_CLASS_32_BITS, R32F),
+ INFO(VIEW_CLASS_32_BITS, RGB10_A2UI),
+ INFO(VIEW_CLASS_32_BITS, RGBA8UI),
+ INFO(VIEW_CLASS_32_BITS, RG16UI),
+ INFO(VIEW_CLASS_32_BITS, R32UI),
+ INFO(VIEW_CLASS_32_BITS, RGBA8I),
+ INFO(VIEW_CLASS_32_BITS, RG16I),
+ INFO(VIEW_CLASS_32_BITS, R32I),
+ INFO(VIEW_CLASS_32_BITS, RGB10_A2),
+ INFO(VIEW_CLASS_32_BITS, RGBA8),
+ INFO(VIEW_CLASS_32_BITS, RG16),
+ INFO(VIEW_CLASS_32_BITS, RGBA8_SNORM),
+ INFO(VIEW_CLASS_32_BITS, RG16_SNORM),
+ INFO(VIEW_CLASS_32_BITS, SRGB8_ALPHA8),
+ INFO(VIEW_CLASS_32_BITS, RGB9_E5),
+ INFO(VIEW_CLASS_24_BITS, RGB8),
+ INFO(VIEW_CLASS_24_BITS, RGB8_SNORM),
+ INFO(VIEW_CLASS_24_BITS, SRGB8),
+ INFO(VIEW_CLASS_24_BITS, RGB8UI),
+ INFO(VIEW_CLASS_24_BITS, RGB8I),
+ INFO(VIEW_CLASS_16_BITS, R16F),
+ INFO(VIEW_CLASS_16_BITS, RG8UI),
+ INFO(VIEW_CLASS_16_BITS, R16UI),
+ INFO(VIEW_CLASS_16_BITS, RG8I),
+ INFO(VIEW_CLASS_16_BITS, R16I),
+ INFO(VIEW_CLASS_16_BITS, RG8),
+ INFO(VIEW_CLASS_16_BITS, R16),
+ INFO(VIEW_CLASS_16_BITS, RG8_SNORM),
+ INFO(VIEW_CLASS_16_BITS, R16_SNORM),
+ INFO(VIEW_CLASS_8_BITS, R8UI),
+ INFO(VIEW_CLASS_8_BITS, R8I),
+ INFO(VIEW_CLASS_8_BITS, R8),
+ INFO(VIEW_CLASS_8_BITS, R8_SNORM),
+ INFO(VIEW_CLASS_RGTC1_RED, COMPRESSED_RED_RGTC1),
+ INFO(VIEW_CLASS_RGTC1_RED, COMPRESSED_SIGNED_RED_RGTC1),
+ INFO(VIEW_CLASS_RGTC2_RG, COMPRESSED_RG_RGTC2),
+ INFO(VIEW_CLASS_RGTC2_RG, COMPRESSED_SIGNED_RG_RGTC2),
+ INFO(VIEW_CLASS_BPTC_UNORM, COMPRESSED_RGBA_BPTC_UNORM_ARB),
+ INFO(VIEW_CLASS_BPTC_UNORM, COMPRESSED_SRGB_ALPHA_BPTC_UNORM_ARB),
+ INFO(VIEW_CLASS_BPTC_FLOAT, COMPRESSED_RGB_BPTC_SIGNED_FLOAT_ARB),
+ INFO(VIEW_CLASS_BPTC_FLOAT, COMPRESSED_RGB_BPTC_UNSIGNED_FLOAT_ARB),
+};
+#undef INFO
+
+/**
+ * Lookup format view class based on internalformat
+ * \return VIEW_CLASS if internalformat found in table, GL_FALSE otherwise.
+ */
+static GLenum
+lookup_view_class(GLenum internalformat)
+{
+ GLuint i;
+
+ for (i = 0; i < ARRAY_SIZE(_compatible_internal_formats); i++) {
+ if (_compatible_internal_formats[i].internal_format == internalformat)
+ return _compatible_internal_formats[i].view_class;
+ }
+ return GL_FALSE;
+}
+
+/**
+ * Compute the size of the next mipmap level.
+ */
+static void
+next_mipmap_level_size(GLenum target,
+ GLint *width, GLint *height, GLint *depth)
+{
+ if (*width > 1) {
+ *width /= 2;
+ }
+
+ if ((*height > 1) && (target != GL_TEXTURE_1D_ARRAY)) {
+ *height /= 2;
+ }
+
+ if ((*depth > 1) && (target != GL_TEXTURE_2D_ARRAY)) {
+ *depth /= 2;
+ }
+}
+
+/** Helper to get a particular texture image in a texture object */
+static struct gl_texture_image *
+get_tex_image(struct gl_context *ctx,
+ struct gl_texture_object *texObj,
+ GLuint face, GLuint level)
+{
+ struct gl_texture_image *texImage;
+
+ if (!texObj)
+ return NULL;
+
+ texImage = texObj->Image[face][level];
+ if (!texImage) {
+ texImage = ctx->Driver.NewTextureImage(ctx);
+ if (!texImage) {
+ _mesa_error(ctx, GL_OUT_OF_MEMORY, "texture image allocation");
+ return NULL;
+ }
+
+ texObj->Image[face][level] = texImage;
+
+ /* Set the 'back' pointer */
+ texImage->TexObject = texObj;
+ texImage->Level = level;
+ texImage->Face = face;
+ }
+
+ return texImage;
+}
+
+/**
+ * Initialize new texture's gl_texture_image structures. Will not call driver
+ * to allocate new space, simply record relevant layer, face, format, etc.
+ * \return GL_FALSE if any error, GL_TRUE otherwise.
+ */
+static GLboolean
+initialize_texture_fields(struct gl_context *ctx,
+ GLenum target,
+ struct gl_texture_object *texObj,
+ GLint levels,
+ GLsizei width, GLsizei height, GLsizei depth,
+ GLenum internalFormat, gl_format texFormat)
+{
+ const GLuint numFaces = _mesa_num_tex_faces(target);
+ GLint level, levelWidth = width, levelHeight = height, levelDepth = depth;
+ GLuint face;
+
+ /* Pretend we are bound to initialize the gl_texture_image structs */
+ texObj->Target = target;
+
+ /* Set up all the texture object's gl_texture_images */
+ for (level = 0; level < levels; level++) {
+ for (face = 0; face < numFaces; face++) {
+ struct gl_texture_image *texImage =
+ get_tex_image(ctx, texObj, face, level);
+
+ if (!texImage) {
+ _mesa_error(ctx, GL_OUT_OF_MEMORY, "glTexStorage");
+ return GL_FALSE;
+ }
+
+ _mesa_init_teximage_fields(ctx, texImage,
+ levelWidth, levelHeight, levelDepth,
+ 0, internalFormat, texFormat);
+ }
+
+ next_mipmap_level_size(target, &levelWidth, &levelHeight, &levelDepth);
+ }
+
+ /* "unbind" */
+ texObj->Target = 0;
+
+ return GL_TRUE;
+}
+
+#define RETURN_IF_SUPPORTED(t) do { \
+ if (newTarget == GL_ ## t) \
+ return GL_TRUE; \
+} while (0)
+
+/**
+ * Check for compatible target
+ * If an error is found, record it with _mesa_error()
+ * \return GL_FALSE if any error, GL_TRUE otherwise.
+ */
+static GLboolean
+target_valid(struct gl_context *ctx, GLenum origTarget, GLenum newTarget)
+{
+ /*
+ * From ARB_texture_view spec:
+ ---------------------------------------------------------------------------------------------------------
+ | Original target | Valid new targets |
+ ---------------------------------------------------------------------------------------------------------
+ | TEXTURE_1D | TEXTURE_1D, TEXTURE_1D_ARRAY |
+ | ------------------------------------------------------------------------------------------------------- |
+ | TEXTURE_2D | TEXTURE_2D, TEXTURE_2D_ARRAY |
+ | ------------------------------------------------------------------------------------------------------- |
+ | TEXTURE_3D | TEXTURE_3D |
+ | ------------------------------------------------------------------------------------------------------- |
+ | TEXTURE_CUBE_MAP | TEXTURE_CUBE_MAP, TEXTURE_2D, TEXTURE_2D_ARRAY, TEXTURE_CUBE_MAP_ARRAY |
+ | ------------------------------------------------------------------------------------------------------- |
+ | TEXTURE_RECTANGLE | TEXTURE_RECTANGLE |
+ | ------------------------------------------------------------------------------------------------------- |
+ | TEXTURE_BUFFER | <none> |
+ | ------------------------------------------------------------------------------------------------------- |
+ | TEXTURE_1D_ARRAY | TEXTURE_1D_ARRAY, TEXTURE_1D |
+ | ------------------------------------------------------------------------------------------------------- |
+ | TEXTURE_2D_ARRAY | TEXTURE_2D_ARRAY, TEXTURE_2D, TEXTURE_CUBE_MAP, TEXTURE_CUBE_MAP_ARRAY |
+ | ------------------------------------------------------------------------------------------------------- |
+ | TEXTURE_CUBE_MAP_ARRAY | TEXTURE_CUBE_MAP_ARRAY, TEXTURE_2D_ARRAY, TEXTURE_2D, TEXTURE_CUBE_MAP |
+ | ------------------------------------------------------------------------------------------------------- |
+ | TEXTURE_2D_MULTISAMPLE | TEXTURE_2D_MULTISAMPLE, TEXTURE_2D_MULTISAMPLE_ARRAY |
+ | ------------------------------------------------------------------------------------------------------- |
+ | TEXTURE_2D_MULTISAMPLE_ARRAY | TEXTURE_2D_MULTISAMPLE, TEXTURE_2D_MULTISAMPLE_ARRAY |
+ ---------------------------------------------------------------------------------------------------------
+ */
+
+ switch (origTarget) {
+ case GL_TEXTURE_1D:
+ case GL_TEXTURE_1D_ARRAY:
+ RETURN_IF_SUPPORTED(TEXTURE_1D);
+ RETURN_IF_SUPPORTED(TEXTURE_1D_ARRAY);
+ break;
+ case GL_TEXTURE_2D:
+ RETURN_IF_SUPPORTED(TEXTURE_2D);
+ RETURN_IF_SUPPORTED(TEXTURE_2D_ARRAY);
+ break;
+ case GL_TEXTURE_3D:
+ RETURN_IF_SUPPORTED(TEXTURE_3D);
+ break;
+ case GL_TEXTURE_RECTANGLE:
+ RETURN_IF_SUPPORTED(TEXTURE_RECTANGLE);
+ break;
+ case GL_TEXTURE_CUBE_MAP:
+ case GL_TEXTURE_2D_ARRAY:
+ case GL_TEXTURE_CUBE_MAP_ARRAY:
+ RETURN_IF_SUPPORTED(TEXTURE_2D);
+ RETURN_IF_SUPPORTED(TEXTURE_2D_ARRAY);
+ RETURN_IF_SUPPORTED(TEXTURE_CUBE_MAP);
+ RETURN_IF_SUPPORTED(TEXTURE_CUBE_MAP_ARRAY);
+ break;
+ case GL_TEXTURE_2D_MULTISAMPLE:
+ case GL_TEXTURE_2D_MULTISAMPLE_ARRAY:
+ RETURN_IF_SUPPORTED(TEXTURE_2D_MULTISAMPLE);
+ RETURN_IF_SUPPORTED(TEXTURE_2D_MULTISAMPLE_ARRAY);
+ break;
+ }
+ _mesa_error(ctx, GL_INVALID_OPERATION,
+ "glTextureView(illegal target=%s)",
+ _mesa_lookup_enum_by_nr(newTarget));
+ return GL_FALSE;
+}
+#undef RETURN_IF_SUPPORTED
+
+/**
+ * Check for compatible format
+ * If an error is found, record it with _mesa_error()
+ * \return GL_FALSE if any error, GL_TRUE otherwise.
+ */
+static GLboolean
+compatible_format(struct gl_context *ctx, struct gl_texture_object *origTexObj,
+ GLenum internalformat)
+{
+ /* Level 0 of a texture created by glTextureStorage or glTextureView
+ * is always defined.
+ */
+ struct gl_texture_image *texImage = origTexObj->Image[0][0];
+ GLenum origInternalFormat = texImage->InternalFormat;
+
+ /* The two textures' internal formats must be compatible according to
+ * Table 3.X.2 (Compatible internal formats for TextureView)
+ * if the internal format exists in that table the view class must match.
+ * The internal formats must be identical if not in that table,
+ * or an INVALID_OPERATION error is generated.
+ */
+ if (origInternalFormat == internalformat)
+ return GL_TRUE;
+
+ if (lookup_view_class(origInternalFormat) ==
+ lookup_view_class(internalformat))
+ return GL_TRUE;
+
+ _mesa_error(ctx, GL_INVALID_OPERATION,
+ "glTextureView(internalformat %s not compatible with origtexture %s)",
+ _mesa_lookup_enum_by_nr(internalformat),
+ _mesa_lookup_enum_by_nr(origInternalFormat));
+ return GL_FALSE;
+}
+
/**
* glTextureView (ARB_texture_view)
* If an error is found, record it with _mesa_error()
@@ -53,13 +387,235 @@ _mesa_TextureView(GLuint texture, GLenum target, GLuint origtexture,
GLuint minlevel, GLuint numlevels,
GLuint minlayer, GLuint numlayers)
{
+ struct gl_texture_object *texObj;
+ struct gl_texture_object *origTexObj;
+ struct gl_texture_image *origTexImage;
+ GLuint newViewMinLevel, newViewMinLayer;
+ GLuint newViewNumLevels, newViewNumLayers;
+ GLsizei width, height, depth;
+ gl_format texFormat;
+ GLboolean sizeOK, dimensionsOK;
+ GLenum faceTarget;
+
GET_CURRENT_CONTEXT(ctx);
if (MESA_VERBOSE & (VERBOSE_API | VERBOSE_TEXTURE))
- _mesa_debug(ctx, "glTextureView (unfinished) %d %s %d %s %d %d %d %d\n",
+ _mesa_debug(ctx, "glTextureView %d %s %d %s %d %d %d %d\n",
texture, _mesa_lookup_enum_by_nr(target), origtexture,
_mesa_lookup_enum_by_nr(internalformat),
minlevel, numlevels, minlayer, numlayers);
+ if (origtexture == 0) {
+ _mesa_error(ctx, GL_INVALID_VALUE, "glTextureView(origtexture = 0x%x)", origtexture);
+ return;
+ }
+
+ /* Need original texture information to validate arguments */
+ origTexObj = _mesa_lookup_texture(ctx, origtexture);
+
+ /* If <origtexture> is not the name of a texture, INVALID_VALUE is generated. */
+ if (!origTexObj) {
+ _mesa_error(ctx, GL_INVALID_VALUE, "glTextureView(origtexture = 0x%x)", origtexture);
+ return;
+ }
+
+ /* If <origtexture>'s TEXTURE_IMMUTABLE_FORMAT value is not TRUE,
+ * INVALID_OPERATION is generated.
+ */
+ if (!origTexObj->Immutable) {
+ _mesa_error(ctx, GL_INVALID_OPERATION, "glTextureView(origtexture not immutable)");
+ return;
+ }
+
+ /* If <texture> is 0, INVALID_VALUE is generated. */
+ if (texture == 0) {
+ _mesa_error(ctx, GL_INVALID_VALUE, "glTextureView(texture = 0)");
+ return;
+ }
+
+ /* If <texture> is not a valid name returned by GenTextures,
+ * the error INVALID_OPERATION is generated.
+ */
+ texObj = _mesa_lookup_texture(ctx, texture);
+ if (texObj == NULL) {
+ _mesa_error(ctx, GL_INVALID_OPERATION, "glTextureView(texture 0x%x non-gen name)", texture);
+ return;
+ }
+
+ /* If <texture> has already been bound and given a target, then
+ * the error INVALID_OPERATION is generated.
+ */
+ if (texObj->Target) {
+ _mesa_error(ctx, GL_INVALID_OPERATION, "glTextureView(texture 0x%x already bound)", texture);
+ return;
+ }
+
+ /* Check for compatible target */
+ if (!target_valid(ctx, origTexObj->Target, target)) {
+ return; /* error was recorded */
+ }
+
+ /* minlevel and minlayer are relative to the view of origtexture */
+ /* If minlevel or minlayer is greater than level or layer, respectively,
+ * of origtexture return INVALID_VALUE.
+ */
+ newViewMinLevel = origTexObj->MinLevel + minlevel;
+ newViewMinLayer = origTexObj->MinLayer + minlayer;
+ if (newViewMinLevel >= (origTexObj->MinLevel + origTexObj->NumLevels) ||
+ newViewMinLayer >= (origTexObj->MinLayer + origTexObj->NumLayers)) {
+ _mesa_error(ctx, GL_INVALID_VALUE, "glTextureView(origtexture = 0x%x)", origtexture);
+ return;
+ }
+
+ if (!compatible_format(ctx, origTexObj, internalformat)) {
+ return; // Error logged
+ }
+
+ texFormat = _mesa_choose_texture_format(ctx, texObj, target, 0,
+ internalformat, GL_NONE, GL_NONE);
+ assert(texFormat != MESA_FORMAT_NONE);
+
+ newViewNumLevels = MIN2(numlevels, origTexObj->NumLevels - minlevel);
+ newViewNumLayers = MIN2(numlayers, origTexObj->NumLayers - minlayer);
+
+ faceTarget = origTexObj->Target;
+ if (faceTarget == GL_TEXTURE_CUBE_MAP)
+ faceTarget = GL_TEXTURE_CUBE_MAP_POSITIVE_X + minlayer;
+
+ /* Get a reference to what will become this View's base level */
+ origTexImage = _mesa_select_tex_image(ctx, origTexObj,
+ faceTarget, minlevel);
+ width = origTexImage->Width;
+ height = origTexImage->Height;
+ depth = origTexImage->Depth;
+
+ /* Adjust width, height, depth to be appropriate for new target */
+ switch (target) {
+ case GL_TEXTURE_1D:
+ case GL_TEXTURE_3D:
+ break;
+
+ case GL_TEXTURE_1D_ARRAY:
+ height = (GLsizei) newViewNumLayers;
+ break;
+
+ case GL_TEXTURE_2D:
+ case GL_TEXTURE_2D_MULTISAMPLE:
+ case GL_TEXTURE_RECTANGLE:
+ case GL_TEXTURE_CUBE_MAP:
+ depth = 1;
+ break;
+
+ case GL_TEXTURE_2D_ARRAY:
+ case GL_TEXTURE_CUBE_MAP_ARRAY:
+ case GL_TEXTURE_2D_MULTISAMPLE_ARRAY:
+ depth = newViewNumLayers;
+ break;
+ }
+
+ /* If the dimensions of the original texture are larger than the maximum
+ * supported dimensions of the new target, the error INVALID_OPERATION is
+ * generated. For example, if the original texture has a TEXTURE_2D_ARRAY
+ * target and its width is greater than MAX_CUBE_MAP_TEXTURE_SIZE, an error
+ * will be generated if TextureView is called to create a TEXTURE_CUBE_MAP
+ * view.
+ */
+ dimensionsOK = _mesa_legal_texture_dimensions(ctx, target, 0,
+ width, height, depth, 0);
+ if (!dimensionsOK) {
+ _mesa_error(ctx, GL_INVALID_OPERATION, "glTextureView(invalid width or height or depth)");
+ return;
+ }
+
+ sizeOK = ctx->Driver.TestProxyTexImage(ctx, target, 0, texFormat,
+ width, height, depth, 0);
+ if (!sizeOK) {
+ _mesa_error(ctx, GL_INVALID_OPERATION, "glTextureView(invalid texture size)");
+ return;
+ }
+
+ /* If <target> is TEXTURE_1D, TEXTURE_2D, TEXTURE_3D, TEXTURE_RECTANGLE,
+ * or TEXTURE_2D_MULTISAMPLE and <numlayers> does not equal 1, the error
+ * INVALID_VALUE is generated.
+ */
+ switch (target) {
+ case GL_TEXTURE_1D:
+ case GL_TEXTURE_2D:
+ case GL_TEXTURE_3D:
+ case GL_TEXTURE_RECTANGLE:
+ case GL_TEXTURE_2D_MULTISAMPLE:
+ if (numlayers != 1) {
+ _mesa_error(ctx, GL_INVALID_VALUE, "glTextureView(numlayers %d != 1)", numlayers);
+ return;
+ }
+ break;
+
+ case GL_TEXTURE_CUBE_MAP:
+ /* If the new texture's target is TEXTURE_CUBE_MAP, the clamped <numlayers>
+ * must be equal to 6.
+ */
+ if (newViewNumLayers != 6) {
+ _mesa_error(ctx, GL_INVALID_VALUE, "glTextureView(clamped numlayers %d != 6)",
+ newViewNumLayers);
+ return;
+ }
+ break;
+
+ case GL_TEXTURE_CUBE_MAP_ARRAY:
+ /* If the new texture's target is TEXTURE_CUBE_MAP_ARRAY,
+ * then <numlayers> counts layer-faces rather than layers,
+ * and the clamped <numlayers> must be a multiple of 6.
+ * Otherwise, the error INVALID_VALUE is generated.
+ */
+ if ((newViewNumLayers % 6) != 0) {
+ _mesa_error(ctx, GL_INVALID_VALUE, "glTextureView(clamped numlayers %d is not a multiple of 6)",
+ newViewNumLayers);
+ return;
+ }
+ break;
+ }
+
+ /* If the new texture's target is TEXTURE_CUBE_MAP or
+ * TEXTURE_CUBE_MAP_ARRAY, the width and height of the original texture's
+ * levels must be equal otherwise the error INVALID_OPERATION is generated.
+ */
+ if ((target == GL_TEXTURE_CUBE_MAP || target == GL_TEXTURE_CUBE_MAP_ARRAY) &&
+ (origTexImage->Width != origTexImage->Height)) {
+ _mesa_error(ctx, GL_INVALID_OPERATION, "glTextureView(origtexture width (%d) != height (%d))",
+ origTexImage->Width, origTexImage->Height);
+ return;
+ }
+
+ /* When the original texture's target is TEXTURE_CUBE_MAP, the layer
+ * parameters are interpreted in the same order as if it were a
+ * TEXTURE_CUBE_MAP_ARRAY with 6 layer-faces.
+ */
+
+ /* If the internal format does not exactly match the internal format of the
+ * original texture, the contents of the memory are reinterpreted in the
+ * same manner as for image bindings described in
+ * section 3.9.20 (Texture Image Loads and Stores).
+ */
+
+ /* TEXTURE_BASE_LEVEL and TEXTURE_MAX_LEVEL are interpreted
+ * relative to the view and not relative to the original data store.
+ */
+
+ if (!initialize_texture_fields(ctx, target, texObj, newViewNumLevels,
+ width, height, depth,
+ internalformat, texFormat)) {
+ return; /* Already recorded error */
+ }
+
+ texObj->MinLevel = newViewMinLevel;
+ texObj->MinLayer = newViewMinLayer;
+ texObj->NumLevels = newViewNumLevels;
+ texObj->NumLayers = newViewNumLayers;
+ texObj->Immutable = GL_TRUE;
+ texObj->ImmutableLevels = origTexObj->ImmutableLevels;
+ texObj->Target = target;
+ if (!ctx->Driver.TextureView(ctx, texObj, origTexObj)) {
+ return; /* driver recorded error */
+ }
}
--
1.8.1.2
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