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https://gitlab.freedesktop.org/mesa/mesa.git
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mesa: refactor _mesa_get_teximage() code
Break different formats into different functions to make it easier to read.
This commit is contained in:
Brian Paul
parent
217a40d8d9
commit
bde7874317
1 changed files with 302 additions and 158 deletions
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@ -85,9 +85,279 @@ type_with_negative_values(GLenum type)
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}
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/**
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* glGetTexImage for color index pixels.
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*/
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static void
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get_tex_color_index(GLcontext *ctx, GLuint dimensions,
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GLenum format, GLenum type, GLvoid *pixels,
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const struct gl_texture_image *texImage)
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{
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const GLint width = texImage->Width;
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const GLint height = texImage->Height;
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const GLint depth = texImage->Depth;
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const GLuint indexBits =
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_mesa_get_format_bits(texImage->TexFormat, GL_TEXTURE_INDEX_SIZE_EXT);
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const GLbitfield transferOps = 0x0;
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GLint img, row, col;
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for (img = 0; img < depth; img++) {
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for (row = 0; row < height; row++) {
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GLuint indexRow[MAX_WIDTH];
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void *dest = _mesa_image_address(dimensions, &ctx->Pack, pixels,
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width, height, format, type,
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img, row, 0);
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assert(dest);
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if (indexBits == 8) {
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const GLubyte *src = (const GLubyte *) texImage->Data;
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src += width * (img * texImage->Height + row);
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for (col = 0; col < width; col++) {
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indexRow[col] = src[col];
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}
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}
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else if (indexBits == 16) {
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const GLushort *src = (const GLushort *) texImage->Data;
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src += width * (img * texImage->Height + row);
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for (col = 0; col < width; col++) {
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indexRow[col] = src[col];
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}
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}
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else {
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_mesa_problem(ctx, "Color index problem in _mesa_GetTexImage");
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}
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_mesa_pack_index_span(ctx, width, type, dest,
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indexRow, &ctx->Pack, transferOps);
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}
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}
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}
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/**
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* glGetTexImage for depth/Z pixels.
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*/
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static void
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get_tex_depth(GLcontext *ctx, GLuint dimensions,
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GLenum format, GLenum type, GLvoid *pixels,
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const struct gl_texture_image *texImage)
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{
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const GLint width = texImage->Width;
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const GLint height = texImage->Height;
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const GLint depth = texImage->Depth;
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GLint img, row, col;
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for (img = 0; img < depth; img++) {
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for (row = 0; row < height; row++) {
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GLfloat depthRow[MAX_WIDTH];
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void *dest = _mesa_image_address(dimensions, &ctx->Pack, pixels,
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width, height, format, type,
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img, row, 0);
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assert(dest);
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for (col = 0; col < width; col++) {
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texImage->FetchTexelf(texImage, col, row, img, depthRow + col);
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}
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_mesa_pack_depth_span(ctx, width, dest, type, depthRow, &ctx->Pack);
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}
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}
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}
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/**
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* glGetTexImage for depth/stencil pixels.
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*/
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static void
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get_tex_depth_stencil(GLcontext *ctx, GLuint dimensions,
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GLenum format, GLenum type, GLvoid *pixels,
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const struct gl_texture_image *texImage)
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{
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const GLint width = texImage->Width;
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const GLint height = texImage->Height;
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const GLint depth = texImage->Depth;
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const GLuint *src = (const GLuint *) texImage->Data;
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GLint img, row;
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for (img = 0; img < depth; img++) {
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for (row = 0; row < height; row++) {
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void *dest = _mesa_image_address(dimensions, &ctx->Pack, pixels,
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width, height, format, type,
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img, row, 0);
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_mesa_memcpy(dest, src, width * sizeof(GLuint));
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if (ctx->Pack.SwapBytes) {
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_mesa_swap4((GLuint *) dest, width);
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}
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src += width * row + width * height * img;
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}
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}
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}
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/**
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* glGetTexImage for YCbCr pixels.
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*/
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static void
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get_tex_ycbcr(GLcontext *ctx, GLuint dimensions,
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GLenum format, GLenum type, GLvoid *pixels,
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const struct gl_texture_image *texImage)
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{
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const GLint width = texImage->Width;
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const GLint height = texImage->Height;
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const GLint depth = texImage->Depth;
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const GLint rowstride = texImage->RowStride;
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const GLushort *src = (const GLushort *) texImage->Data;
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GLint img, row;
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for (img = 0; img < depth; img++) {
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for (row = 0; row < height; row++) {
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void *dest = _mesa_image_address(dimensions, &ctx->Pack, pixels,
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width, height, format, type,
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img, row, 0);
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_mesa_memcpy(dest, src, width * sizeof(GLushort));
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/* check for byte swapping */
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if ((texImage->TexFormat == MESA_FORMAT_YCBCR
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&& type == GL_UNSIGNED_SHORT_8_8_REV_MESA) ||
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(texImage->TexFormat == MESA_FORMAT_YCBCR_REV
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&& type == GL_UNSIGNED_SHORT_8_8_MESA)) {
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if (!ctx->Pack.SwapBytes)
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_mesa_swap2((GLushort *) dest, width);
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}
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else if (ctx->Pack.SwapBytes) {
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_mesa_swap2((GLushort *) dest, width);
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}
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src += rowstride;
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}
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}
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}
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/**
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* glGetTexImagefor sRGB pixels;
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*/
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static void
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get_tex_srgb(GLcontext *ctx, GLuint dimensions,
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GLenum format, GLenum type, GLvoid *pixels,
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const struct gl_texture_image *texImage)
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{
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const GLint width = texImage->Width;
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const GLint height = texImage->Height;
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const GLint depth = texImage->Depth;
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const GLbitfield transferOps = 0x0;
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GLint img, row;
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for (img = 0; img < depth; img++) {
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for (row = 0; row < height; row++) {
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void *dest = _mesa_image_address(dimensions, &ctx->Pack, pixels,
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width, height, format, type,
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img, row, 0);
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GLfloat rgba[MAX_WIDTH][4];
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GLint col;
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/* convert row to RGBA format */
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for (col = 0; col < width; col++) {
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texImage->FetchTexelf(texImage, col, row, img, rgba[col]);
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if (texImage->_BaseFormat == GL_LUMINANCE) {
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rgba[col][RCOMP] = linear_to_nonlinear(rgba[col][RCOMP]);
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rgba[col][GCOMP] = 0.0;
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rgba[col][BCOMP] = 0.0;
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}
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else if (texImage->_BaseFormat == GL_LUMINANCE_ALPHA) {
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rgba[col][RCOMP] = linear_to_nonlinear(rgba[col][RCOMP]);
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rgba[col][GCOMP] = 0.0;
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rgba[col][BCOMP] = 0.0;
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}
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else if (texImage->_BaseFormat == GL_RGB ||
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texImage->_BaseFormat == GL_RGBA) {
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rgba[col][RCOMP] = linear_to_nonlinear(rgba[col][RCOMP]);
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rgba[col][GCOMP] = linear_to_nonlinear(rgba[col][GCOMP]);
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rgba[col][BCOMP] = linear_to_nonlinear(rgba[col][BCOMP]);
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}
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}
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_mesa_pack_rgba_span_float(ctx, width, (GLfloat (*)[4]) rgba,
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format, type, dest,
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&ctx->Pack, transferOps);
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}
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}
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}
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/**
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* glGetTexImagefor RGBA, Luminance, etc. pixels.
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* This is the slow way since we use texture sampling.
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*/
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static void
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get_tex_rgba(GLcontext *ctx, GLuint dimensions,
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GLenum format, GLenum type, GLvoid *pixels,
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const struct gl_texture_image *texImage)
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{
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const GLint width = texImage->Width;
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const GLint height = texImage->Height;
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const GLint depth = texImage->Depth;
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/* Normally, no pixel transfer ops are performed during glGetTexImage.
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* The only possible exception is component clamping to [0,1].
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*/
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GLbitfield transferOps = 0x0;
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GLint img, row;
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for (img = 0; img < depth; img++) {
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for (row = 0; row < height; row++) {
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void *dest = _mesa_image_address(dimensions, &ctx->Pack, pixels,
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width, height, format, type,
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img, row, 0);
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GLfloat rgba[MAX_WIDTH][4];
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GLint col;
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GLenum dataType = _mesa_get_format_datatype(texImage->TexFormat);
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/* clamp does not apply to GetTexImage (final conversion)?
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* Looks like we need clamp though when going from format
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* containing negative values to unsigned format.
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*/
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if (format == GL_LUMINANCE || format == GL_LUMINANCE_ALPHA) {
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transferOps |= IMAGE_CLAMP_BIT;
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}
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else if (!type_with_negative_values(type) &&
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(dataType == GL_FLOAT ||
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dataType == GL_SIGNED_NORMALIZED)) {
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transferOps |= IMAGE_CLAMP_BIT;
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}
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for (col = 0; col < width; col++) {
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texImage->FetchTexelf(texImage, col, row, img, rgba[col]);
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if (texImage->_BaseFormat == GL_ALPHA) {
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rgba[col][RCOMP] = 0.0F;
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rgba[col][GCOMP] = 0.0F;
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rgba[col][BCOMP] = 0.0F;
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}
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else if (texImage->_BaseFormat == GL_LUMINANCE) {
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rgba[col][GCOMP] = 0.0F;
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rgba[col][BCOMP] = 0.0F;
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rgba[col][ACOMP] = 1.0F;
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}
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else if (texImage->_BaseFormat == GL_LUMINANCE_ALPHA) {
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rgba[col][GCOMP] = 0.0F;
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rgba[col][BCOMP] = 0.0F;
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}
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else if (texImage->_BaseFormat == GL_INTENSITY) {
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rgba[col][GCOMP] = 0.0F;
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rgba[col][BCOMP] = 0.0F;
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rgba[col][ACOMP] = 1.0F;
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}
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}
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_mesa_pack_rgba_span_float(ctx, width, (GLfloat (*)[4]) rgba,
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format, type, dest,
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&ctx->Pack, transferOps);
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}
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}
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}
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/**
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* This is the software fallback for Driver.GetTexImage().
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* All error checking will have been done before this routine is called.
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* The texture image must be mapped.
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*/
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void
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_mesa_get_teximage(GLcontext *ctx, GLenum target, GLint level,
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@ -95,7 +365,21 @@ _mesa_get_teximage(GLcontext *ctx, GLenum target, GLint level,
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struct gl_texture_object *texObj,
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struct gl_texture_image *texImage)
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{
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const GLuint dimensions = (target == GL_TEXTURE_3D) ? 3 : 2;
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GLuint dimensions;
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/* If we get here, the texture image should be mapped */
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assert(texImage->Data);
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switch (target) {
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case GL_TEXTURE_1D:
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dimensions = 1;
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break;
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case GL_TEXTURE_3D:
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dimensions = 3;
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break;
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default:
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dimensions = 2;
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}
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if (_mesa_is_bufferobj(ctx->Pack.BufferObj)) {
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/* Packing texture image into a PBO.
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@ -118,163 +402,23 @@ _mesa_get_teximage(GLcontext *ctx, GLenum target, GLint level,
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pixels = ADD_POINTERS(buf, pixels);
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}
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{
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const GLint width = texImage->Width;
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const GLint height = texImage->Height;
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const GLint depth = texImage->Depth;
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GLint img, row;
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for (img = 0; img < depth; img++) {
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for (row = 0; row < height; row++) {
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/* compute destination address in client memory */
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GLvoid *dest = _mesa_image_address( dimensions, &ctx->Pack, pixels,
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width, height, format, type,
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img, row, 0);
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assert(dest);
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if (format == GL_COLOR_INDEX) {
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GLuint indexRow[MAX_WIDTH];
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GLint col;
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GLuint indexBits = _mesa_get_format_bits(texImage->TexFormat, GL_TEXTURE_INDEX_SIZE_EXT);
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/* Can't use FetchTexel here because that returns RGBA */
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if (indexBits == 8) {
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const GLubyte *src = (const GLubyte *) texImage->Data;
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src += width * (img * texImage->Height + row);
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for (col = 0; col < width; col++) {
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indexRow[col] = src[col];
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}
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}
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else if (indexBits == 16) {
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const GLushort *src = (const GLushort *) texImage->Data;
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src += width * (img * texImage->Height + row);
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for (col = 0; col < width; col++) {
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indexRow[col] = src[col];
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}
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}
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else {
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_mesa_problem(ctx,
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"Color index problem in _mesa_GetTexImage");
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}
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_mesa_pack_index_span(ctx, width, type, dest,
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indexRow, &ctx->Pack,
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0 /* no image transfer */);
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}
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else if (format == GL_DEPTH_COMPONENT) {
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GLfloat depthRow[MAX_WIDTH];
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GLint col;
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for (col = 0; col < width; col++) {
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(*texImage->FetchTexelf)(texImage, col, row, img,
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depthRow + col);
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}
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_mesa_pack_depth_span(ctx, width, dest, type,
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depthRow, &ctx->Pack);
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}
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else if (format == GL_DEPTH_STENCIL_EXT) {
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/* XXX Note: we're bypassing texImage->FetchTexel()! */
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const GLuint *src = (const GLuint *) texImage->Data;
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src += width * row + width * height * img;
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_mesa_memcpy(dest, src, width * sizeof(GLuint));
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if (ctx->Pack.SwapBytes) {
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_mesa_swap4((GLuint *) dest, width);
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}
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}
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else if (format == GL_YCBCR_MESA) {
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/* No pixel transfer */
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const GLint rowstride = texImage->RowStride;
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MEMCPY(dest,
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(const GLushort *) texImage->Data + row * rowstride,
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width * sizeof(GLushort));
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/* check for byte swapping */
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if ((texImage->TexFormat == MESA_FORMAT_YCBCR
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&& type == GL_UNSIGNED_SHORT_8_8_REV_MESA) ||
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(texImage->TexFormat == MESA_FORMAT_YCBCR_REV
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&& type == GL_UNSIGNED_SHORT_8_8_MESA)) {
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if (!ctx->Pack.SwapBytes)
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_mesa_swap2((GLushort *) dest, width);
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}
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else if (ctx->Pack.SwapBytes) {
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_mesa_swap2((GLushort *) dest, width);
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}
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}
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#if FEATURE_EXT_texture_sRGB
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else if (_mesa_get_format_color_encoding(texImage->TexFormat)
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== GL_SRGB) {
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/* special case this since need to backconvert values */
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/* convert row to RGBA format */
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GLfloat rgba[MAX_WIDTH][4];
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GLint col;
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GLbitfield transferOps = 0x0;
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for (col = 0; col < width; col++) {
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(*texImage->FetchTexelf)(texImage, col, row, img, rgba[col]);
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if (texImage->_BaseFormat == GL_LUMINANCE) {
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rgba[col][RCOMP] = linear_to_nonlinear(rgba[col][RCOMP]);
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rgba[col][GCOMP] = 0.0;
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rgba[col][BCOMP] = 0.0;
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}
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else if (texImage->_BaseFormat == GL_LUMINANCE_ALPHA) {
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rgba[col][RCOMP] = linear_to_nonlinear(rgba[col][RCOMP]);
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rgba[col][GCOMP] = 0.0;
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rgba[col][BCOMP] = 0.0;
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}
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else if (texImage->_BaseFormat == GL_RGB ||
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texImage->_BaseFormat == GL_RGBA) {
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rgba[col][RCOMP] = linear_to_nonlinear(rgba[col][RCOMP]);
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rgba[col][GCOMP] = linear_to_nonlinear(rgba[col][GCOMP]);
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rgba[col][BCOMP] = linear_to_nonlinear(rgba[col][BCOMP]);
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}
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}
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_mesa_pack_rgba_span_float(ctx, width, (GLfloat (*)[4]) rgba,
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format, type, dest,
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&ctx->Pack, transferOps);
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}
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#endif /* FEATURE_EXT_texture_sRGB */
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else {
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/* general case: convert row to RGBA format */
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GLfloat rgba[MAX_WIDTH][4];
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GLint col;
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GLbitfield transferOps = 0x0;
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GLenum dataType =
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_mesa_get_format_datatype(texImage->TexFormat);
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/* clamp does not apply to GetTexImage (final conversion)?
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* Looks like we need clamp though when going from format
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* containing negative values to unsigned format.
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*/
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if (format == GL_LUMINANCE || format == GL_LUMINANCE_ALPHA)
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transferOps |= IMAGE_CLAMP_BIT;
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else if (!type_with_negative_values(type) &&
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(dataType == GL_FLOAT ||
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dataType == GL_SIGNED_NORMALIZED))
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transferOps |= IMAGE_CLAMP_BIT;
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for (col = 0; col < width; col++) {
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(*texImage->FetchTexelf)(texImage, col, row, img, rgba[col]);
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if (texImage->_BaseFormat == GL_ALPHA) {
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rgba[col][RCOMP] = 0.0;
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rgba[col][GCOMP] = 0.0;
|
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rgba[col][BCOMP] = 0.0;
|
||||
}
|
||||
else if (texImage->_BaseFormat == GL_LUMINANCE) {
|
||||
rgba[col][GCOMP] = 0.0;
|
||||
rgba[col][BCOMP] = 0.0;
|
||||
rgba[col][ACOMP] = 1.0;
|
||||
}
|
||||
else if (texImage->_BaseFormat == GL_LUMINANCE_ALPHA) {
|
||||
rgba[col][GCOMP] = 0.0;
|
||||
rgba[col][BCOMP] = 0.0;
|
||||
}
|
||||
else if (texImage->_BaseFormat == GL_INTENSITY) {
|
||||
rgba[col][GCOMP] = 0.0;
|
||||
rgba[col][BCOMP] = 0.0;
|
||||
rgba[col][ACOMP] = 1.0;
|
||||
}
|
||||
}
|
||||
_mesa_pack_rgba_span_float(ctx, width, (GLfloat (*)[4]) rgba,
|
||||
format, type, dest,
|
||||
&ctx->Pack, transferOps);
|
||||
} /* format */
|
||||
} /* row */
|
||||
} /* img */
|
||||
if (format == GL_COLOR_INDEX) {
|
||||
get_tex_color_index(ctx, dimensions, format, type, pixels, texImage);
|
||||
}
|
||||
else if (format == GL_DEPTH_COMPONENT) {
|
||||
get_tex_depth(ctx, dimensions, format, type, pixels, texImage);
|
||||
}
|
||||
else if (format == GL_DEPTH_STENCIL_EXT) {
|
||||
get_tex_depth_stencil(ctx, dimensions, format, type, pixels, texImage);
|
||||
}
|
||||
else if (format == GL_YCBCR_MESA) {
|
||||
get_tex_ycbcr(ctx, dimensions, format, type, pixels, texImage);
|
||||
}
|
||||
else if (_mesa_get_format_color_encoding(texImage->TexFormat) == GL_SRGB) {
|
||||
get_tex_srgb(ctx, dimensions, format, type, pixels, texImage);
|
||||
}
|
||||
else {
|
||||
get_tex_rgba(ctx, dimensions, format, type, pixels, texImage);
|
||||
}
|
||||
|
||||
if (_mesa_is_bufferobj(ctx->Pack.BufferObj)) {
|
||||
|
|
|
|||
Loading…
Add table
Reference in a new issue