/**
* Try to do glGetTexImage() with simple memcpy().
* \return GL_TRUE if done, GL_FALSE otherwise
*/
static GLboolean
get_tex_memcpy(struct gl_context *ctx, GLenum format, GLenum type,
GLvoid *pixels,
struct gl_texture_image *texImage)
{
const GLenum target = texImage->TexObject->Target;
GLboolean memCopy = GL_FALSE;
/*
* Check if we can use memcpy to copy from the hardware texture
* format to the user's format/type.
* Note that GL's pixel transfer ops don't apply to glGetTexImage()
*/
if (target == GL_TEXTURE_1D ||
target == GL_TEXTURE_2D ||
target == GL_TEXTURE_RECTANGLE ||
_mesa_is_cube_face(target)) {
memCopy = _mesa_format_matches_format_and_type(texImage->TexFormat,
format, type,
ctx->Pack.SwapBytes);
}
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);
GLubyte *src;
GLint srcRowStride;
/* map src texture buffer */
ctx->Driver.MapTextureImage(ctx, texImage, 0,
0, 0, texImage->Width, texImage->Height,
GL_MAP_READ_BIT, &src, &srcRowStride);
if (src) {
if (bytesPerRow == dstRowStride && bytesPerRow == srcRowStride) {
memcpy(dst, src, bytesPerRow * texImage->Height);
}
else {
GLuint row;
for (row = 0; row < texImage->Height; row++) {
memcpy(dst, src, bytesPerRow);
dst += dstRowStride;
src += srcRowStride;
}
}
/* unmap src texture buffer */
ctx->Driver.UnmapTextureImage(ctx, texImage, 0);
}
else {
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glGetTexImage");
}
}
return memCopy;
}
/**
* Try to do glGetTexImage() with simple memcpy().
* \return GL_TRUE if done, GL_FALSE otherwise
*/
static GLboolean
get_tex_memcpy(struct gl_context *ctx, GLenum format, GLenum type,
GLvoid *pixels,
struct gl_texture_image *texImage)
{
const GLenum target = texImage->TexObject->Target;
GLboolean memCopy = GL_FALSE;
/*
* 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 (target == GL_TEXTURE_1D ||
target == GL_TEXTURE_2D ||
_mesa_is_cube_face(target)) {
if ((texImage->TexFormat == MESA_FORMAT_ARGB8888) &&
format == GL_BGRA &&
(type == GL_UNSIGNED_BYTE || type == GL_UNSIGNED_INT_8_8_8_8_REV) &&
!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_L16 &&
format == GL_LUMINANCE &&
type == GL_UNSIGNED_SHORT) {
memCopy = GL_TRUE;
}
else if (texImage->TexFormat == MESA_FORMAT_A8 &&
format == GL_ALPHA &&
type == GL_UNSIGNED_BYTE) {
memCopy = GL_TRUE;
}
else if (texImage->TexFormat == MESA_FORMAT_A16 &&
format == GL_ALPHA &&
type == GL_UNSIGNED_SHORT) {
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);
GLubyte *src;
GLint srcRowStride;
/* map src texture buffer */
ctx->Driver.MapTextureImage(ctx, texImage, 0,
0, 0, texImage->Width, texImage->Height,
GL_MAP_READ_BIT, &src, &srcRowStride);
if (src) {
if (bytesPerRow == dstRowStride && bytesPerRow == srcRowStride) {
memcpy(dst, src, bytesPerRow * texImage->Height);
}
else {
GLuint row;
for (row = 0; row < texImage->Height; row++) {
memcpy(dst, src, bytesPerRow);
dst += dstRowStride;
src += srcRowStride;
}
}
/* unmap src texture buffer */
ctx->Driver.UnmapTextureImage(ctx, texImage, 0);
}
else {
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glGetTexImage");
}
}
return memCopy;
}
