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Diffstat (limited to 'src/mesa/main/texgetimage.c')
| -rw-r--r-- | src/mesa/main/texgetimage.c | 356 |
1 files changed, 356 insertions, 0 deletions
diff --git a/src/mesa/main/texgetimage.c b/src/mesa/main/texgetimage.c new file mode 100644 index 00000000000..70a25080cb0 --- /dev/null +++ b/src/mesa/main/texgetimage.c @@ -0,0 +1,356 @@ +/* + * Mesa 3-D graphics library + * Version: 7.5 + * + * Copyright (C) 1999-2008 Brian Paul All Rights Reserved. + * Copyright (c) 2009 VMware, Inc. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included + * in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS + * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN + * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + */ + + +/** + * Code for glGetTexImage() and glGetCompressedTexImage(). + */ + + +#include "glheader.h" +#include "context.h" +#include "image.h" +#include "texcompress.h" +#include "texformat.h" +#include "texgetimage.h" + + + +#if FEATURE_EXT_texture_sRGB + +/** + * Test if given texture image is an sRGB format. + */ +static GLboolean +is_srgb_teximage(const struct gl_texture_image *texImage) +{ + switch (texImage->TexFormat->MesaFormat) { + case MESA_FORMAT_SRGB8: + case MESA_FORMAT_SRGBA8: + case MESA_FORMAT_SARGB8: + case MESA_FORMAT_SL8: + case MESA_FORMAT_SLA8: + case MESA_FORMAT_SRGB_DXT1: + case MESA_FORMAT_SRGBA_DXT1: + case MESA_FORMAT_SRGBA_DXT3: + case MESA_FORMAT_SRGBA_DXT5: + return GL_TRUE; + default: + return GL_FALSE; + } +} + + +/** + * Convert a float value from linear space to a + * non-linear sRGB value in [0, 255]. + * Not terribly efficient. + */ +static INLINE GLfloat +linear_to_nonlinear(GLfloat cl) +{ + /* can't have values outside [0, 1] */ + GLfloat cs; + if (cl < 0.0031308) { + cs = 12.92 * cl; + } + else { + cs = 1.055 * _mesa_pow(cl, 0.41666) - 0.055; + } + return cs; +} + +#endif /* FEATURE_EXT_texture_sRGB */ + + +/** + * Can the given type represent negative values? + */ +static INLINE GLboolean +type_with_negative_values(GLenum type) +{ + switch (type) { + case GL_BYTE: + case GL_SHORT: + case GL_INT: + case GL_FLOAT: + case GL_HALF_FLOAT_ARB: + return GL_TRUE; + default: + return GL_FALSE; + } +} + + +/** + * This is the software fallback for Driver.GetTexImage(). + * All error checking will have been done before this routine is called. + */ +void +_mesa_get_teximage(GLcontext *ctx, GLenum target, GLint level, + GLenum format, GLenum type, GLvoid *pixels, + struct gl_texture_object *texObj, + struct gl_texture_image *texImage) +{ + const GLuint dimensions = (target == GL_TEXTURE_3D) ? 3 : 2; + + if (ctx->Pack.BufferObj->Name) { + /* Packing texture image into a PBO. + * Map the (potentially) VRAM-based buffer into our process space so + * we can write into it with the code below. + * A hardware driver might use a sophisticated blit to move the + * texture data to the PBO if the PBO is in VRAM along with the texture. + */ + GLubyte *buf = (GLubyte *) + ctx->Driver.MapBuffer(ctx, GL_PIXEL_PACK_BUFFER_EXT, + GL_WRITE_ONLY_ARB, ctx->Pack.BufferObj); + if (!buf) { + /* buffer is already mapped - that's an error */ + _mesa_error(ctx, GL_INVALID_OPERATION,"glGetTexImage(PBO is mapped)"); + return; + } + /* <pixels> was an offset into the PBO. + * Now make it a real, client-side pointer inside the mapped region. + */ + pixels = ADD_POINTERS(buf, pixels); + } + else if (!pixels) { + /* not an error */ + return; + } + + { + const GLint width = texImage->Width; + const GLint height = texImage->Height; + const GLint depth = texImage->Depth; + GLint img, row; + for (img = 0; img < depth; img++) { + for (row = 0; row < height; row++) { + /* compute destination address in client memory */ + GLvoid *dest = _mesa_image_address( dimensions, &ctx->Pack, pixels, + width, height, format, type, + img, row, 0); + assert(dest); + + if (format == GL_COLOR_INDEX) { + GLuint indexRow[MAX_WIDTH]; + GLint col; + /* Can't use FetchTexel here because that returns RGBA */ + if (texImage->TexFormat->IndexBits == 8) { + const GLubyte *src = (const GLubyte *) texImage->Data; + src += width * (img * texImage->Height + row); + for (col = 0; col < width; col++) { + indexRow[col] = src[col]; + } + } + else if (texImage->TexFormat->IndexBits == 16) { + const GLushort *src = (const GLushort *) texImage->Data; + src += width * (img * texImage->Height + row); + for (col = 0; col < width; col++) { + indexRow[col] = src[col]; + } + } + else { + _mesa_problem(ctx, + "Color index problem in _mesa_GetTexImage"); + } + _mesa_pack_index_span(ctx, width, type, dest, + indexRow, &ctx->Pack, + 0 /* no image transfer */); + } + else if (format == GL_DEPTH_COMPONENT) { + GLfloat depthRow[MAX_WIDTH]; + GLint col; + for (col = 0; col < width; col++) { + (*texImage->FetchTexelf)(texImage, col, row, img, + depthRow + col); + } + _mesa_pack_depth_span(ctx, width, dest, type, + depthRow, &ctx->Pack); + } + else if (format == GL_DEPTH_STENCIL_EXT) { + /* XXX Note: we're bypassing texImage->FetchTexel()! */ + const GLuint *src = (const GLuint *) texImage->Data; + src += width * row + width * height * img; + _mesa_memcpy(dest, src, width * sizeof(GLuint)); + if (ctx->Pack.SwapBytes) { + _mesa_swap4((GLuint *) dest, width); + } + } + else if (format == GL_YCBCR_MESA) { + /* No pixel transfer */ + const GLint rowstride = texImage->RowStride; + MEMCPY(dest, + (const GLushort *) texImage->Data + row * rowstride, + width * sizeof(GLushort)); + /* check for byte swapping */ + if ((texImage->TexFormat->MesaFormat == MESA_FORMAT_YCBCR + && type == GL_UNSIGNED_SHORT_8_8_REV_MESA) || + (texImage->TexFormat->MesaFormat == MESA_FORMAT_YCBCR_REV + && type == GL_UNSIGNED_SHORT_8_8_MESA)) { + if (!ctx->Pack.SwapBytes) + _mesa_swap2((GLushort *) dest, width); + } + else if (ctx->Pack.SwapBytes) { + _mesa_swap2((GLushort *) dest, width); + } + } +#if FEATURE_EXT_texture_sRGB + else if (is_srgb_teximage(texImage)) { + /* special case this since need to backconvert values */ + /* convert row to RGBA format */ + GLfloat rgba[MAX_WIDTH][4]; + GLint col; + GLbitfield transferOps = 0x0; + + for (col = 0; col < width; col++) { + (*texImage->FetchTexelf)(texImage, col, row, img, rgba[col]); + if (texImage->_BaseFormat == GL_LUMINANCE) { + rgba[col][RCOMP] = linear_to_nonlinear(rgba[col][RCOMP]); + rgba[col][GCOMP] = 0.0; + rgba[col][BCOMP] = 0.0; + } + else if (texImage->_BaseFormat == GL_LUMINANCE_ALPHA) { + rgba[col][RCOMP] = linear_to_nonlinear(rgba[col][RCOMP]); + rgba[col][GCOMP] = 0.0; + rgba[col][BCOMP] = 0.0; + } + else if (texImage->_BaseFormat == GL_RGB || + texImage->_BaseFormat == GL_RGBA) { + rgba[col][RCOMP] = linear_to_nonlinear(rgba[col][RCOMP]); + rgba[col][GCOMP] = linear_to_nonlinear(rgba[col][GCOMP]); + rgba[col][BCOMP] = linear_to_nonlinear(rgba[col][BCOMP]); + } + } + _mesa_pack_rgba_span_float(ctx, width, (GLfloat (*)[4]) rgba, + format, type, dest, + &ctx->Pack, transferOps); + } +#endif /* FEATURE_EXT_texture_sRGB */ + else { + /* general case: convert row to RGBA format */ + GLfloat rgba[MAX_WIDTH][4]; + GLint col; + GLbitfield transferOps = 0x0; + + /* clamp does not apply to GetTexImage (final conversion)? + * Looks like we need clamp though when going from format + * containing negative values to unsigned format. + */ + if (format == GL_LUMINANCE || format == GL_LUMINANCE_ALPHA) + transferOps |= IMAGE_CLAMP_BIT; + else if (!type_with_negative_values(type) && + (texImage->TexFormat->DataType == GL_FLOAT || + texImage->TexFormat->DataType == GL_SIGNED_NORMALIZED)) + transferOps |= IMAGE_CLAMP_BIT; + + for (col = 0; col < width; col++) { + (*texImage->FetchTexelf)(texImage, col, row, img, rgba[col]); + if (texImage->_BaseFormat == GL_ALPHA) { + rgba[col][RCOMP] = 0.0; + rgba[col][GCOMP] = 0.0; + 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 (ctx->Pack.BufferObj->Name) { + ctx->Driver.UnmapBuffer(ctx, GL_PIXEL_PACK_BUFFER_EXT, + ctx->Pack.BufferObj); + } +} + + + +/** + * This is the software fallback for Driver.GetCompressedTexImage(). + * All error checking will have been done before this routine is called. + */ +void +_mesa_get_compressed_teximage(GLcontext *ctx, GLenum target, GLint level, + GLvoid *img, + struct gl_texture_object *texObj, + struct gl_texture_image *texImage) +{ + GLuint size; + + if (ctx->Pack.BufferObj->Name) { + /* pack texture image into a PBO */ + GLubyte *buf; + if ((const GLubyte *) img + texImage->CompressedSize > + (const GLubyte *) ctx->Pack.BufferObj->Size) { + _mesa_error(ctx, GL_INVALID_OPERATION, + "glGetCompressedTexImage(invalid PBO access)"); + return; + } + buf = (GLubyte *) ctx->Driver.MapBuffer(ctx, GL_PIXEL_PACK_BUFFER_EXT, + GL_WRITE_ONLY_ARB, + ctx->Pack.BufferObj); + if (!buf) { + /* buffer is already mapped - that's an error */ + _mesa_error(ctx, GL_INVALID_OPERATION, + "glGetCompressedTexImage(PBO is mapped)"); + return; + } + img = ADD_POINTERS(buf, img); + } + else if (!img) { + /* not an error */ + return; + } + + /* don't use texImage->CompressedSize since that may be padded out */ + size = _mesa_compressed_texture_size(ctx, texImage->Width, texImage->Height, + texImage->Depth, + texImage->TexFormat->MesaFormat); + + /* just memcpy, no pixelstore or pixel transfer */ + _mesa_memcpy(img, texImage->Data, size); + + if (ctx->Pack.BufferObj->Name) { + ctx->Driver.UnmapBuffer(ctx, GL_PIXEL_PACK_BUFFER_EXT, + ctx->Pack.BufferObj); + } +} |