#include "teximage.h"
#include "texobj.h"
#include "texstore.h"
-
+#include "format_utils.h"
+#include "pixeltransfer.h"
/**
* Can the given type represent negative values?
const mesa_format texFormat =
_mesa_get_srgb_format_linear(texImage->TexFormat);
const GLuint width = texImage->Width;
- GLenum destBaseFormat = _mesa_base_pack_format(format);
- GLenum rebaseFormat = GL_NONE;
GLuint height = texImage->Height;
GLuint depth = texImage->Depth;
- GLuint img, row;
- GLfloat (*rgba)[4];
- GLuint (*rgba_uint)[4];
- GLboolean tex_is_integer = _mesa_is_format_integer_color(texImage->TexFormat);
- GLboolean tex_is_uint = _mesa_is_format_unsigned(texImage->TexFormat);
- GLenum texBaseFormat = _mesa_get_format_base_format(texImage->TexFormat);
-
- /* Allocate buffer for one row of texels */
- rgba = malloc(4 * width * sizeof(GLfloat));
- rgba_uint = (GLuint (*)[4]) rgba;
- if (!rgba) {
- _mesa_error(ctx, GL_OUT_OF_MEMORY, "glGetTexImage()");
- return;
- }
+ GLuint img;
+ GLboolean dst_is_integer = _mesa_is_enum_format_integer(format);
+ uint32_t dst_format;
+ int dst_stride;
+ uint8_t rebaseSwizzle[4];
+ bool needsRebase;
+ void *rgba = NULL;
if (texImage->TexObject->Target == GL_TEXTURE_1D_ARRAY) {
depth = height;
height = 1;
}
+ /* Depending on the base format involved we may need to apply a rebase
+ * tranaform (for example: if we download to a Luminance format we want
+ * G=0 and B=0).
+ */
if (texImage->_BaseFormat == GL_LUMINANCE ||
- texImage->_BaseFormat == GL_INTENSITY ||
- texImage->_BaseFormat == GL_LUMINANCE_ALPHA) {
- /* If a luminance (or intensity) texture is read back as RGB(A), the
- * returned value should be (L,0,0,1), not (L,L,L,1). Set rebaseFormat
- * here to get G=B=0.
- */
- rebaseFormat = texImage->_BaseFormat;
- }
- else if ((texImage->_BaseFormat == GL_RGBA ||
- texImage->_BaseFormat == GL_RGB ||
- texImage->_BaseFormat == GL_RG) &&
- (destBaseFormat == GL_LUMINANCE ||
- destBaseFormat == GL_LUMINANCE_ALPHA ||
- destBaseFormat == GL_LUMINANCE_INTEGER_EXT ||
- destBaseFormat == GL_LUMINANCE_ALPHA_INTEGER_EXT)) {
- /* If we're reading back an RGB(A) texture as luminance then we need
- * to return L=tex(R). Note, that's different from glReadPixels which
- * returns L=R+G+B.
- */
- rebaseFormat = GL_LUMINANCE_ALPHA; /* this covers GL_LUMINANCE too */
- }
- else if (texImage->_BaseFormat != texBaseFormat) {
- /* The internal format and the real format differ, so we can't rely
- * on the unpack functions setting the correct constant values.
- * (e.g. reading back GL_RGB8 which is actually RGBA won't set alpha=1)
- */
- switch (texImage->_BaseFormat) {
- case GL_RED:
- if ((texBaseFormat == GL_RGBA ||
- texBaseFormat == GL_RGB ||
- texBaseFormat == GL_RG) &&
- (destBaseFormat == GL_RGBA ||
- destBaseFormat == GL_RGB ||
- destBaseFormat == GL_RG ||
- destBaseFormat == GL_GREEN)) {
- rebaseFormat = texImage->_BaseFormat;
- break;
- }
- /* fall through */
- case GL_RG:
- if ((texBaseFormat == GL_RGBA ||
- texBaseFormat == GL_RGB) &&
- (destBaseFormat == GL_RGBA ||
- destBaseFormat == GL_RGB ||
- destBaseFormat == GL_BLUE)) {
- rebaseFormat = texImage->_BaseFormat;
- break;
- }
- /* fall through */
- case GL_RGB:
- if (texBaseFormat == GL_RGBA &&
- (destBaseFormat == GL_RGBA ||
- destBaseFormat == GL_ALPHA ||
- destBaseFormat == GL_LUMINANCE_ALPHA)) {
- rebaseFormat = texImage->_BaseFormat;
- }
- break;
-
- case GL_ALPHA:
- if (destBaseFormat != GL_ALPHA) {
- rebaseFormat = texImage->_BaseFormat;
- }
- break;
- }
- }
+ texImage->_BaseFormat == GL_INTENSITY) {
+ needsRebase = true;
+ rebaseSwizzle[0] = MESA_FORMAT_SWIZZLE_X;
+ rebaseSwizzle[1] = MESA_FORMAT_SWIZZLE_ZERO;
+ rebaseSwizzle[2] = MESA_FORMAT_SWIZZLE_ZERO;
+ rebaseSwizzle[3] = MESA_FORMAT_SWIZZLE_ONE;
+ } else if (texImage->_BaseFormat == GL_LUMINANCE_ALPHA) {
+ needsRebase = true;
+ rebaseSwizzle[0] = MESA_FORMAT_SWIZZLE_X;
+ rebaseSwizzle[1] = MESA_FORMAT_SWIZZLE_ZERO;
+ rebaseSwizzle[2] = MESA_FORMAT_SWIZZLE_ZERO;
+ rebaseSwizzle[3] = MESA_FORMAT_SWIZZLE_W;
+ } else if (texImage->_BaseFormat != _mesa_get_format_base_format(texFormat)) {
+ needsRebase =
+ _mesa_compute_rgba2base2rgba_component_mapping(texImage->_BaseFormat,
+ rebaseSwizzle);
+ } else {
+ needsRebase = false;
+ }
+
+ /* Describe the dst format */
+ dst_is_integer = _mesa_is_enum_format_integer(format);
+ dst_format = _mesa_format_from_format_and_type(format, type);
+ dst_stride = _mesa_image_row_stride(&ctx->Pack, width, format, type);
+
+ /* Since _mesa_format_convert does not handle transferOps we need to handle
+ * them before we call the function. This requires to convert to RGBA float
+ * first so we can call _mesa_apply_rgba_transfer_ops. If the dst format is
+ * integer then transferOps do not apply.
+ */
+ assert(!transferOps || (transferOps && !dst_is_integer));
for (img = 0; img < depth; img++) {
GLubyte *srcMap;
GLint rowstride;
+ GLubyte *img_src;
+ void *dest;
+ void *src;
+ int src_stride;
+ uint32_t src_format;
/* map src texture buffer */
ctx->Driver.MapTextureImage(ctx, texImage, img,
0, 0, width, height, GL_MAP_READ_BIT,
&srcMap, &rowstride);
- if (srcMap) {
- for (row = 0; row < height; row++) {
- const GLubyte *src = srcMap + row * rowstride;
- void *dest = _mesa_image_address(dimensions, &ctx->Pack, pixels,
- width, height, format, type,
- img, row, 0);
+ if (!srcMap) {
+ _mesa_error(ctx, GL_OUT_OF_MEMORY, "glGetTexImage");
+ goto done;
+ }
- if (tex_is_integer) {
- _mesa_unpack_uint_rgba_row(texFormat, width, src, rgba_uint);
- if (rebaseFormat)
- _mesa_rebase_rgba_uint(width, rgba_uint, rebaseFormat);
- if (tex_is_uint) {
- _mesa_pack_rgba_span_from_uints(ctx, width,
- (GLuint (*)[4]) rgba_uint,
- format, type, dest);
- } else {
- _mesa_pack_rgba_span_from_ints(ctx, width,
- (GLint (*)[4]) rgba_uint,
- format, type, dest);
- }
- } else {
- _mesa_unpack_rgba_row(texFormat, width, src, rgba);
- if (rebaseFormat)
- _mesa_rebase_rgba_float(width, rgba, rebaseFormat);
- _mesa_pack_rgba_span_float(ctx, width, (GLfloat (*)[4]) rgba,
- format, type, dest,
- &ctx->Pack, transferOps);
- }
- }
-
- /* Unmap the src texture buffer */
- ctx->Driver.UnmapTextureImage(ctx, texImage, img);
+ img_src = srcMap;
+ dest = _mesa_image_address(dimensions, &ctx->Pack, pixels,
+ width, height, format, type,
+ img, 0, 0);
+
+ if (transferOps) {
+ uint32_t rgba_format;
+ int rgba_stride;
+ bool need_convert;
+
+ /* We will convert to RGBA float */
+ rgba_format = RGBA8888_FLOAT;
+ rgba_stride = width * 4 * sizeof(GLfloat);
+
+ /* If we are lucky and the dst format matches the RGBA format we need
+ * to convert to, then we can convert directly into the dst buffer
+ * and avoid the final conversion/copy from the rgba buffer to the dst
+ * buffer.
+ */
+ if (format == rgba_format) {
+ need_convert = false;
+ rgba = dest;
+ } else if (rgba == NULL) { /* Allocate the RGBA buffer only once */
+ need_convert = true;
+ rgba = malloc(height * rgba_stride);
+ if (!rgba) {
+ _mesa_error(ctx, GL_OUT_OF_MEMORY, "glGetTexImage()");
+ ctx->Driver.UnmapTextureImage(ctx, texImage, img);
+ return;
+ }
+ }
+
+ _mesa_format_convert(rgba, rgba_format, rgba_stride,
+ img_src, texFormat, rowstride,
+ width, height,
+ needsRebase ? rebaseSwizzle : NULL);
+
+ /* Handle transfer ops now */
+ _mesa_apply_rgba_transfer_ops(ctx, transferOps, width * height, rgba);
+
+ /* If we had to rebase, we have already handled that */
+ needsRebase = false;
+
+ /* If we were lucky and our RGBA conversion matches the dst format, then
+ * we are done.
+ */
+ if (!need_convert)
+ goto do_swap;
+
+ /* Otherwise, we need to convert from RGBA to dst next */
+ src = rgba;
+ src_format = rgba_format;
+ src_stride = rgba_stride;
+ } else {
+ /* No RGBA conversion needed, convert directly to dst */
+ src = img_src;
+ src_format = texFormat;
+ src_stride = rowstride;
}
- else {
- _mesa_error(ctx, GL_OUT_OF_MEMORY, "glGetTexImage");
- break;
+
+ /* Do the conversion to destination format */
+ _mesa_format_convert(dest, dst_format, dst_stride,
+ src, src_format, src_stride,
+ width, height,
+ needsRebase ? rebaseSwizzle : NULL);
+
+ do_swap:
+ /* Handle byte swapping if required */
+ if (ctx->Pack.SwapBytes) {
+ int components = _mesa_components_in_format(format);
+ GLint swapSize = _mesa_sizeof_packed_type(type);
+ if (swapSize == 2)
+ _mesa_swap2((GLushort *) dest, width * height * components);
+ else if (swapSize == 4)
+ _mesa_swap4((GLuint *) dest, width * height * components);
}
+
+ /* Unmap the src texture buffer */
+ ctx->Driver.UnmapTextureImage(ctx, texImage, img);
}
- free(rgba);
+done:
+ if (rgba)
+ free(rgba);
}
projects / mesa.git / commitdiff