[Mesa-dev] [PATCH 7/9] mesa: Fill out ARB_texture_view entry points
Courtney Goeltzenleuchter
courtney at lunarg.com
Mon Nov 25 17:00:33 PST 2013
While incorporating Brian's comments I did some refactoring to consolidate
multiple uses of next_mimap_level_size into one shared helper function.
That adds another commit to the stream. I thought it was big enough now
that I should post the branch to make it easier to use.
I've posted the updated stream, including the next_mipmap_level_size
refactoring on github here:
https://github.com/courtney-lunarg/mesa/tree/texture_view-rc5
Courtney
On Mon, Nov 25, 2013 at 5:49 PM, Courtney Goeltzenleuchter <
courtney at lunarg.com> wrote:
> Add Mesa TextureView logic.
> Incorporate feedback on ARB_texture_view:
> - Add S3TC VIEW_CLASSes to compatibility table
> - Use existing _mesa_get_tex_image
> - Clean up error strings
> - Use bool instead of GLboolean for internal functions
> - Split compound level & layer test into individual tests
>
> Signed-off-by: Courtney Goeltzenleuchter <courtney at LunarG.com>
> ---
> src/mesa/main/textureview.c | 540
> +++++++++++++++++++++++++++++++++++++++++++-
> 1 file changed, 539 insertions(+), 1 deletion(-)
>
> diff --git a/src/mesa/main/textureview.c b/src/mesa/main/textureview.c
> index 4a6bd62..1bfc86b 100644
> --- a/src/mesa/main/textureview.c
> +++ b/src/mesa/main/textureview.c
> @@ -38,10 +38,318 @@
> #include "macros.h"
> #include "teximage.h"
> #include "texobj.h"
> +#include "mipmap.h"
> #include "texstorage.h"
> #include "textureview.h"
> +#include "stdbool.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),
> +};
> +
> +static const struct internal_format_class_info
> s3tc_compatible_internal_formats[] = {
> + INFO(VIEW_CLASS_S3TC_DXT1_RGB, COMPRESSED_RGB_S3TC_DXT1_EXT),
> + INFO(VIEW_CLASS_S3TC_DXT1_RGB, COMPRESSED_SRGB_S3TC_DXT1_EXT),
> + INFO(VIEW_CLASS_S3TC_DXT1_RGBA, COMPRESSED_RGBA_S3TC_DXT1_EXT),
> + INFO(VIEW_CLASS_S3TC_DXT1_RGBA, COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT),
> + INFO(VIEW_CLASS_S3TC_DXT3_RGBA, COMPRESSED_RGBA_S3TC_DXT3_EXT),
> + INFO(VIEW_CLASS_S3TC_DXT3_RGBA, COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT),
> + INFO(VIEW_CLASS_S3TC_DXT5_RGBA, COMPRESSED_RGBA_S3TC_DXT5_EXT),
> + INFO(VIEW_CLASS_S3TC_DXT5_RGBA, COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT),
> +};
> +#undef INFO
> +
> +/**
> + * Lookup format view class based on internalformat
> + * \return VIEW_CLASS if internalformat found in table, false otherwise.
> + */
> +static GLenum
> +lookup_view_class(struct gl_context *ctx, GLenum internalformat)
> +{
> + uint 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;
> + }
> +
> + if (ctx->Extensions.EXT_texture_compression_s3tc &&
> ctx->Extensions.EXT_texture_sRGB) {
> + for (i = 0; i < ARRAY_SIZE(s3tc_compatible_internal_formats); i++) {
> + if (s3tc_compatible_internal_formats[i].internal_format ==
> internalformat)
> + return s3tc_compatible_internal_formats[i].view_class;
> + }
> + }
> + return GL_FALSE;
> +}
> +
> +/**
> + * 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 =
> + _mesa_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);
> + }
> +
> + _mesa_next_mipmap_level_size(target, 0, levelWidth, levelHeight,
> levelDepth,
> + &levelWidth, &levelHeight,
> &levelDepth);
> + }
> +
> + /* "unbind" */
> + texObj->Target = 0;
> +
> + return GL_TRUE;
> +}
> +
> +#define RETURN_IF_SUPPORTED(t) do { \
> + if (newTarget == GL_ ## t) \
> + return true; \
> +} while (0)
> +
> +/**
> + * Check for compatible target
> + * If an error is found, record it with _mesa_error()
> + * \return false if any error, true otherwise.
> + */
> +static bool
> +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 false;
> +}
> +#undef RETURN_IF_SUPPORTED
> +
> +/**
> + * Check for compatible format
> + * If an error is found, record it with _mesa_error()
> + * \return false if any error, true otherwise.
> + */
> +static bool
> +compatible_format(struct gl_context *ctx, const 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];
> + GLint origInternalFormat = texImage->InternalFormat;
> + unsigned int origViewClass, newViewClass;
> +
> +
> + /* 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 true;
> +
> + origViewClass = lookup_view_class(ctx, origInternalFormat);
> + newViewClass = lookup_view_class(ctx, internalformat);
> + if ((origViewClass == newViewClass) && origViewClass != false)
> + return 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 false;
> +}
> +
> /**
> * glTextureView (ARB_texture_view)
> * If an error is found, record it with _mesa_error()
> @@ -53,13 +361,243 @@ _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 =
> %d)", 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 =
> %d)", 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 = %d
> 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 = %d
> 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))
> {
> + _mesa_error(ctx, GL_INVALID_VALUE, "glTextureView(new minlevel (%d)
> > orig minlevel (%d) + orig numlevels (%d))",
> + newViewMinLevel, origTexObj->MinLevel,
> origTexObj->NumLevels);
> + return;
> + }
> +
> + if (newViewMinLayer >= (origTexObj->MinLayer + origTexObj->NumLayers))
> {
> + _mesa_error(ctx, GL_INVALID_VALUE, "glTextureView(new minlayer (%d)
> > orig minlayer (%d) + orig numlayers (%d))",
> + newViewMinLayer, origTexObj->MinLayer,
> origTexObj->NumLayers);
> + 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);
> + if (texFormat == MESA_FORMAT_NONE) return;
> +
> + 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
>
>
--
Courtney Goeltzenleuchter
LunarG
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