[Mesa-dev] [PATCH 2/3] mesa: new _mesa_prepare_mipmap_level() function for mipmap generation
Brian Paul
brianp at vmware.com
Thu Dec 15 16:47:00 PST 2011
This helper function is used during mipmap generation to prepare space
for the destination mipmap levels.
This improves/fixes two things:
1. If the texture object was created with glTexStorage2D, calling
_mesa_TexImage2D() to allocate the new image would generate
INVALID_OPERATION since the texture is marked as immutable.
2. _mesa_TexImage2D() always frees any existing texture image memory
before allocating new memory. That's inefficient if the existing
image is the right size already.
---
src/mesa/main/mipmap.c | 128 +++++++++++++++++++++++++++++++++++------------
src/mesa/main/mipmap.h | 6 ++
2 files changed, 101 insertions(+), 33 deletions(-)
diff --git a/src/mesa/main/mipmap.c b/src/mesa/main/mipmap.c
index fd6e582..867cb22 100644
--- a/src/mesa/main/mipmap.c
+++ b/src/mesa/main/mipmap.c
@@ -1803,6 +1803,81 @@ next_mipmap_level_size(GLenum target, GLint border,
}
}
+
+/**
+ * Helper function for mipmap generation.
+ * Make sure the specified destination mipmap level is the right size/format
+ * for mipmap generation. If not, (re) allocate it.
+ * \return GL_TRUE if successful, GL_FALSE if mipmap generation should stop
+ */
+GLboolean
+_mesa_prepare_mipmap_level(struct gl_context *ctx,
+ struct gl_texture_object *texObj, GLuint level,
+ GLsizei width, GLsizei height, GLsizei depth,
+ GLsizei border, GLenum intFormat, gl_format format)
+{
+ const GLuint numFaces = texObj->Target == GL_TEXTURE_CUBE_MAP ? 6 : 1;
+ GLuint face;
+
+ if (texObj->Immutable) {
+ /* The texture was created with glTexStorage() so the number/size of
+ * mipmap levels is fixed and the storage for all images is already
+ * allocated.
+ */
+ if (!texObj->Image[0][level]) {
+ /* No more levels to create - we're done */
+ return GL_FALSE;
+ }
+ else {
+ /* Nothing to do - the texture memory must have already been
+ * allocated to the right size so we're all set.
+ */
+ return GL_TRUE;
+ }
+ }
+
+ for (face = 0; face < numFaces; face++) {
+ struct gl_texture_image *dstImage;
+ GLenum target;
+
+ if (numFaces == 1)
+ target = texObj->Target;
+ else
+ target = GL_TEXTURE_CUBE_MAP_POSITIVE_X + face;
+
+ dstImage = _mesa_get_tex_image(ctx, texObj, target, level);
+ if (!dstImage) {
+ /* out of memory */
+ return GL_FALSE;
+ }
+
+ if (dstImage->Width != width ||
+ dstImage->Height != height ||
+ dstImage->Depth != depth ||
+ dstImage->Border != border ||
+ dstImage->InternalFormat != intFormat ||
+ dstImage->TexFormat != format) {
+ /* need to (re)allocate image */
+ ctx->Driver.FreeTextureImageBuffer(ctx, dstImage);
+
+ _mesa_init_teximage_fields(ctx, target, dstImage,
+ width, height, depth,
+ border, intFormat, format);
+
+ ctx->Driver.AllocTextureImageBuffer(ctx, dstImage,
+ format, width, height, depth);
+
+ /* in case the mipmap level is part of an FBO: */
+ _mesa_update_fbo_texture(ctx, texObj, face, level);
+
+ ctx->NewState |= _NEW_TEXTURE;
+ }
+ }
+
+ return GL_TRUE;
+}
+
+
static void
generate_mipmap_uncompressed(struct gl_context *ctx, GLenum target,
struct gl_texture_object *texObj,
@@ -1841,31 +1916,20 @@ generate_mipmap_uncompressed(struct gl_context *ctx, GLenum target,
if (!nextLevel)
return;
- /* get dest gl_texture_image */
- dstImage = _mesa_get_tex_image(ctx, texObj, target, level + 1);
- if (!dstImage) {
- _mesa_error(ctx, GL_OUT_OF_MEMORY, "generating mipmaps");
+ if (!_mesa_prepare_mipmap_level(ctx, texObj, level + 1,
+ dstWidth, dstHeight, dstDepth,
+ border, srcImage->InternalFormat,
+ srcImage->TexFormat)) {
return;
}
- /* Free old image data */
- ctx->Driver.FreeTextureImageBuffer(ctx, dstImage);
-
- _mesa_init_teximage_fields(ctx, target, dstImage, dstWidth, dstHeight,
- dstDepth, border, srcImage->InternalFormat,
- srcImage->TexFormat);
-
- /* Alloc storage for new texture image */
- if (!ctx->Driver.AllocTextureImageBuffer(ctx, dstImage,
- dstImage->TexFormat,
- dstWidth, dstHeight,
- dstDepth)) {
+ /* get dest gl_texture_image */
+ dstImage = _mesa_get_tex_image(ctx, texObj, target, level + 1);
+ if (!dstImage) {
_mesa_error(ctx, GL_OUT_OF_MEMORY, "generating mipmaps");
return;
}
- ASSERT(dstImage->TexFormat);
-
if (target == GL_TEXTURE_1D_ARRAY) {
srcDepth = srcHeight;
dstDepth = dstHeight;
@@ -2052,9 +2116,7 @@ generate_mipmap_compressed(struct gl_context *ctx, GLenum target,
return;
}
- /* Free old image data */
- ctx->Driver.FreeTextureImageBuffer(ctx, dstImage);
-
+ /* rescale src image to dest image */
_mesa_generate_mipmap_level(target, temp_datatype, components, border,
srcWidth, srcHeight, srcDepth,
(const GLubyte **) &temp_src,
@@ -2062,19 +2124,19 @@ generate_mipmap_compressed(struct gl_context *ctx, GLenum target,
dstWidth, dstHeight, dstDepth,
&temp_dst, temp_dst_stride);
- /* initialize new image */
- _mesa_init_teximage_fields(ctx, target, dstImage, dstWidth, dstHeight,
- dstDepth, border, srcImage->InternalFormat,
- srcImage->TexFormat);
-
- /* Free old dest texture image buffer */
- ctx->Driver.FreeTextureImageBuffer(ctx, dstImage);
+ if (!_mesa_prepare_mipmap_level(ctx, texObj, level + 1,
+ dstWidth, dstHeight, dstDepth,
+ border, srcImage->InternalFormat,
+ srcImage->TexFormat)) {
+ return;
+ }
- ctx->Driver.TexImage2D(ctx, target, level + 1,
- srcImage->InternalFormat,
- dstWidth, dstHeight, border,
- temp_base_format, temp_datatype,
- temp_dst, &ctx->DefaultPacking, texObj, dstImage);
+ /* The image space was allocated above so use glTexSubImage now */
+ ctx->Driver.TexSubImage2D(ctx, target, level + 1,
+ 0, 0, dstWidth, dstHeight,
+ temp_base_format, temp_datatype,
+ temp_dst, &ctx->DefaultPacking,
+ texObj, dstImage);
/* swap src and dest pointers */
{
diff --git a/src/mesa/main/mipmap.h b/src/mesa/main/mipmap.h
index 1fb9146..072794c 100644
--- a/src/mesa/main/mipmap.h
+++ b/src/mesa/main/mipmap.h
@@ -41,6 +41,12 @@ _mesa_generate_mipmap_level(GLenum target,
GLint dstRowStride);
+extern GLboolean
+_mesa_prepare_mipmap_level(struct gl_context *ctx,
+ struct gl_texture_object *texObj, GLuint level,
+ GLsizei width, GLsizei height, GLsizei depth,
+ GLsizei border, GLenum intFormat, gl_format format);
+
extern void
_mesa_generate_mipmap(struct gl_context *ctx, GLenum target,
struct gl_texture_object *texObj);
--
1.7.3.4
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