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mesa: lift memcpy_get_tex_image() code from intel driver into core Mesa

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The code should work for any driver.
This commit is contained in:
Brian Paul 2009-10-29 16:29:31 -06:00
parent bde7874317
commit fcbf663640
1 changed files with 83 additions and 1 deletions
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84
src/mesa/main/texgetimage.c
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@ -354,6 +354,85 @@ get_tex_rgba(GLcontext *ctx, GLuint dimensions,
}
/**
* Try to do glGetTexImage() with simple memcpy().
* \return GL_TRUE if done, GL_FALSE otherwise
*/
static GLboolean
get_tex_memcpy(GLcontext *ctx, GLenum format, GLenum type, GLvoid *pixels,
const struct gl_texture_object *texObj,
const struct gl_texture_image *texImage)
{
GLboolean memCopy = GL_FALSE;
/* Texture image should have been mapped already */
assert(texImage->Data);
/*
* Check if the src/dst formats are compatible.
* Also note that GL's pixel transfer ops don't apply to glGetTexImage()
* so we don't have to worry about those.
* XXX more format combinations could be supported here.
*/
if ((texObj->Target == GL_TEXTURE_1D ||
texObj->Target == GL_TEXTURE_2D ||
texObj->Target == GL_TEXTURE_RECTANGLE ||
(texObj->Target >= GL_TEXTURE_CUBE_MAP_POSITIVE_X &&
texObj->Target <= GL_TEXTURE_CUBE_MAP_NEGATIVE_Z))) {
if (texImage->TexFormat == MESA_FORMAT_ARGB8888 &&
format == GL_BGRA &&
type == GL_UNSIGNED_BYTE &&
!ctx->Pack.SwapBytes &&
_mesa_little_endian()) {
memCopy = GL_TRUE;
}
else if (texImage->TexFormat == MESA_FORMAT_AL88 &&
format == GL_LUMINANCE_ALPHA &&
type == GL_UNSIGNED_BYTE &&
!ctx->Pack.SwapBytes &&
_mesa_little_endian()) {
memCopy = GL_TRUE;
}
else if (texImage->TexFormat == MESA_FORMAT_L8 &&
format == GL_LUMINANCE &&
type == GL_UNSIGNED_BYTE) {
memCopy = GL_TRUE;
}
else if (texImage->TexFormat == MESA_FORMAT_A8 &&
format == GL_ALPHA &&
type == GL_UNSIGNED_BYTE) {
memCopy = GL_TRUE;
}
}
if (memCopy) {
const GLuint bpp = _mesa_get_format_bytes(texImage->TexFormat);
const GLuint bytesPerRow = texImage->Width * bpp;
GLubyte *dst =
_mesa_image_address2d(&ctx->Pack, pixels, texImage->Width,
texImage->Height, format, type, 0, 0);
const GLint dstRowStride =
_mesa_image_row_stride(&ctx->Pack, texImage->Width, format, type);
const GLubyte *src = texImage->Data;
const GLint srcRowStride = texImage->RowStride * bpp;
GLuint row;
if (bytesPerRow == dstRowStride && bytesPerRow == srcRowStride) {
memcpy(dst, src, bytesPerRow * texImage->Height);
}
else {
for (row = 0; row < texImage->Height; row++) {
memcpy(dst, src, bytesPerRow);
dst += dstRowStride;
src += srcRowStride;
}
}
}
return memCopy;
}
/**
* This is the software fallback for Driver.GetTexImage().
* All error checking will have been done before this routine is called.
@ -402,7 +481,10 @@ _mesa_get_teximage(GLcontext *ctx, GLenum target, GLint level,
pixels = ADD_POINTERS(buf, pixels);
}
if (format == GL_COLOR_INDEX) {
if (get_tex_memcpy(ctx, format, type, pixels, texObj, texImage)) {
/* all done */
}
else if (format == GL_COLOR_INDEX) {
get_tex_color_index(ctx, dimensions, format, type, pixels, texImage);
}
else if (format == GL_DEPTH_COMPONENT) {