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authorBrian Paul <[email protected]>2009-10-29 16:29:31 -0600
committerBrian Paul <[email protected]>2009-10-29 16:31:57 -0600
commitfcbf66364032743abeb41a82a5ceaf68a15d900f (patch)
tree1137ab35bbf106a055d44ecb08a2b9a7bb74b920 /src/mesa/main
parentbde7874317bfbab284397bc611fc71263cbc0975 (diff)
mesa: lift memcpy_get_tex_image() code from intel driver into core Mesa
The code should work for any driver.
Diffstat (limited to 'src/mesa/main')
-rw-r--r--src/mesa/main/texgetimage.c84
1 files changed, 83 insertions, 1 deletions
diff --git a/src/mesa/main/texgetimage.c b/src/mesa/main/texgetimage.c
index 3dff86feb12..10c6947c374 100644
--- a/src/mesa/main/texgetimage.c
+++ b/src/mesa/main/texgetimage.c
@@ -355,6 +355,85 @@ 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.
* The texture image must be mapped.
@@ -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) {