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texstore: Add a generic implementation of GL_ARB_clear_texture 

Adds an implmentation of the ClearTexSubImage driver entry point that just
maps the texture and writes the values in. The extension is not yet enabled by
default because it doesn't work with multisample textures as they don't have a
simple linear layout.

Reviewed-by: Jason Ekstrand <jason.ekstrand@intel.com>
This commit is contained in:
Neil Roberts 2014-06-10 16:19:58 +01:00
parent fbbbf7529c
commit df9945ca26
2 changed files with 79 additions and 0 deletions
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72
src/mesa/main/texstore.c
View File

@ -4094,6 +4094,78 @@ _mesa_store_texsubimage(struct gl_context *ctx, GLuint dims,
format, type, pixels, packing, "glTexSubImage");
}
static void
clear_image_to_zero(GLubyte *dstMap, GLint dstRowStride,
GLsizei width, GLsizei height,
GLsizei clearValueSize)
{
GLsizei y;
for (y = 0; y < height; y++) {
memset(dstMap, 0, clearValueSize * width);
dstMap += dstRowStride;
}
}
static void
clear_image_to_value(GLubyte *dstMap, GLint dstRowStride,
GLsizei width, GLsizei height,
const GLvoid *clearValue,
GLsizei clearValueSize)
{
GLsizei y, x;
for (y = 0; y < height; y++) {
for (x = 0; x < width; x++) {
memcpy(dstMap, clearValue, clearValueSize);
dstMap += clearValueSize;
}
dstMap += dstRowStride - clearValueSize * width;
}
}
/*
* Fallback for Driver.ClearTexSubImage().
*/
void
_mesa_store_cleartexsubimage(struct gl_context *ctx,
struct gl_texture_image *texImage,
GLint xoffset, GLint yoffset, GLint zoffset,
GLsizei width, GLsizei height, GLsizei depth,
const GLvoid *clearValue)
{
GLubyte *dstMap;
GLint dstRowStride;
GLsizeiptr clearValueSize;
GLsizei z;
clearValueSize = _mesa_get_format_bytes(texImage->TexFormat);
for (z = 0; z < depth; z++) {
ctx->Driver.MapTextureImage(ctx, texImage,
z + zoffset, xoffset, yoffset,
width, height,
GL_MAP_WRITE_BIT,
&dstMap, &dstRowStride);
if (dstMap == NULL) {
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glClearTex*Image");
return;
}
if (clearValue) {
clear_image_to_value(dstMap, dstRowStride,
width, height,
clearValue,
clearValueSize);
} else {
clear_image_to_zero(dstMap, dstRowStride,
width, height,
clearValueSize);
}
ctx->Driver.UnmapTextureImage(ctx, texImage, z + zoffset);
}
}
/**
* Fallback for Driver.CompressedTexImage()

7
src/mesa/main/texstore.h
View File

@ -117,6 +117,13 @@ _mesa_store_texsubimage(struct gl_context *ctx, GLuint dims,
const struct gl_pixelstore_attrib *packing);
extern void
_mesa_store_cleartexsubimage(struct gl_context *ctx,
struct gl_texture_image *texImage,
GLint xoffset, GLint yoffset, GLint zoffset,
GLsizei width, GLsizei height, GLsizei depth,
const GLvoid *clearValue);
extern void
_mesa_store_compressed_teximage(struct gl_context *ctx, GLuint dims,
struct gl_texture_image *texImage,