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| /* |
| * Mesa 3-D graphics library |
| * |
| * Copyright (C) 2011 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 |
| * THE AUTHORS OR COPYRIGHT HOLDERS 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. |
| */ |
| |
| /** |
| * Functions for mapping/unmapping texture images. |
| */ |
| |
| |
| #include "main/context.h" |
| #include "main/fbobject.h" |
| #include "main/teximage.h" |
| #include "main/texobj.h" |
| #include "swrast/swrast.h" |
| #include "swrast/s_context.h" |
| |
| |
| /** |
| * Allocate a new swrast_texture_image (a subclass of gl_texture_image). |
| * Called via ctx->Driver.NewTextureImage(). |
| */ |
| struct gl_texture_image * |
| _swrast_new_texture_image( struct gl_context *ctx ) |
| { |
| (void) ctx; |
| return (struct gl_texture_image *) CALLOC_STRUCT(swrast_texture_image); |
| } |
| |
| |
| /** |
| * Free a swrast_texture_image (a subclass of gl_texture_image). |
| * Called via ctx->Driver.DeleteTextureImage(). |
| */ |
| void |
| _swrast_delete_texture_image(struct gl_context *ctx, |
| struct gl_texture_image *texImage) |
| { |
| /* Nothing special for the subclass yet */ |
| _mesa_delete_texture_image(ctx, texImage); |
| } |
| |
| static unsigned int |
| texture_slices(struct gl_texture_image *texImage) |
| { |
| if (texImage->TexObject->Target == GL_TEXTURE_1D_ARRAY) |
| return texImage->Height; |
| else |
| return texImage->Depth; |
| } |
| |
| unsigned int |
| _swrast_teximage_slice_height(struct gl_texture_image *texImage) |
| { |
| /* For 1D array textures, the slices are all 1 pixel high, and Height is |
| * the number of slices. |
| */ |
| if (texImage->TexObject->Target == GL_TEXTURE_1D_ARRAY) |
| return 1; |
| else |
| return texImage->Height; |
| } |
| |
| /** |
| * Called via ctx->Driver.AllocTextureImageBuffer() |
| */ |
| GLboolean |
| _swrast_alloc_texture_image_buffer(struct gl_context *ctx, |
| struct gl_texture_image *texImage) |
| { |
| struct swrast_texture_image *swImg = swrast_texture_image(texImage); |
| GLuint bytesPerSlice; |
| GLuint slices = texture_slices(texImage); |
| GLuint i; |
| |
| if (!_swrast_init_texture_image(texImage)) |
| return GL_FALSE; |
| |
| bytesPerSlice = _mesa_format_image_size(texImage->TexFormat, texImage->Width, |
| _swrast_teximage_slice_height(texImage), 1); |
| |
| assert(!swImg->Buffer); |
| swImg->Buffer = _mesa_align_malloc(bytesPerSlice * slices, 512); |
| if (!swImg->Buffer) |
| return GL_FALSE; |
| |
| /* RowStride and ImageSlices[] describe how to address texels in 'Data' */ |
| swImg->RowStride = _mesa_format_row_stride(texImage->TexFormat, |
| texImage->Width); |
| |
| for (i = 0; i < slices; i++) { |
| swImg->ImageSlices[i] = swImg->Buffer + bytesPerSlice * i; |
| } |
| |
| return GL_TRUE; |
| } |
| |
| |
| /** |
| * Code that overrides ctx->Driver.AllocTextureImageBuffer may use this to |
| * initialize the fields of swrast_texture_image without allocating the image |
| * buffer or initializing RowStride or the contents of ImageSlices. |
| * |
| * Returns GL_TRUE on success, GL_FALSE on memory allocation failure. |
| */ |
| GLboolean |
| _swrast_init_texture_image(struct gl_texture_image *texImage) |
| { |
| struct swrast_texture_image *swImg = swrast_texture_image(texImage); |
| |
| if ((texImage->Width == 1 || _mesa_is_pow_two(texImage->Width2)) && |
| (texImage->Height == 1 || _mesa_is_pow_two(texImage->Height2)) && |
| (texImage->Depth == 1 || _mesa_is_pow_two(texImage->Depth2))) |
| swImg->_IsPowerOfTwo = GL_TRUE; |
| else |
| swImg->_IsPowerOfTwo = GL_FALSE; |
| |
| /* Compute Width/Height/DepthScale for mipmap lod computation */ |
| if (texImage->TexObject->Target == GL_TEXTURE_RECTANGLE_NV) { |
| /* scale = 1.0 since texture coords directly map to texels */ |
| swImg->WidthScale = 1.0; |
| swImg->HeightScale = 1.0; |
| swImg->DepthScale = 1.0; |
| } |
| else { |
| swImg->WidthScale = (GLfloat) texImage->Width; |
| swImg->HeightScale = (GLfloat) texImage->Height; |
| swImg->DepthScale = (GLfloat) texImage->Depth; |
| } |
| |
| assert(!swImg->ImageSlices); |
| swImg->ImageSlices = calloc(texture_slices(texImage), sizeof(void *)); |
| if (!swImg->ImageSlices) |
| return GL_FALSE; |
| |
| return GL_TRUE; |
| } |
| |
| |
| /** |
| * Called via ctx->Driver.FreeTextureImageBuffer() |
| */ |
| void |
| _swrast_free_texture_image_buffer(struct gl_context *ctx, |
| struct gl_texture_image *texImage) |
| { |
| struct swrast_texture_image *swImage = swrast_texture_image(texImage); |
| if (swImage->Buffer) { |
| _mesa_align_free(swImage->Buffer); |
| swImage->Buffer = NULL; |
| } |
| |
| free(swImage->ImageSlices); |
| swImage->ImageSlices = NULL; |
| } |
| |
| |
| /** |
| * Error checking for debugging only. |
| */ |
| static void |
| _mesa_check_map_teximage(struct gl_texture_image *texImage, |
| GLuint slice, GLuint x, GLuint y, GLuint w, GLuint h) |
| { |
| |
| if (texImage->TexObject->Target == GL_TEXTURE_1D) |
| assert(y == 0 && h == 1); |
| |
| assert(x < texImage->Width || texImage->Width == 0); |
| assert(y < texImage->Height || texImage->Height == 0); |
| assert(x + w <= texImage->Width); |
| assert(y + h <= texImage->Height); |
| } |
| |
| /** |
| * Map a 2D slice of a texture image into user space. |
| * (x,y,w,h) defines a region of interest (ROI). Reading/writing texels |
| * outside of the ROI is undefined. |
| * |
| * \param texImage the texture image |
| * \param slice the 3D image slice or array texture slice |
| * \param x, y, w, h region of interest |
| * \param mode bitmask of GL_MAP_READ_BIT, GL_MAP_WRITE_BIT |
| * \param mapOut returns start of mapping of region of interest |
| * \param rowStrideOut returns row stride (in bytes) |
| */ |
| void |
| _swrast_map_teximage(struct gl_context *ctx, |
| struct gl_texture_image *texImage, |
| GLuint slice, |
| GLuint x, GLuint y, GLuint w, GLuint h, |
| GLbitfield mode, |
| GLubyte **mapOut, |
| GLint *rowStrideOut) |
| { |
| struct swrast_texture_image *swImage = swrast_texture_image(texImage); |
| GLubyte *map; |
| GLint stride, texelSize; |
| GLuint bw, bh; |
| |
| _mesa_check_map_teximage(texImage, slice, x, y, w, h); |
| |
| texelSize = _mesa_get_format_bytes(texImage->TexFormat); |
| stride = _mesa_format_row_stride(texImage->TexFormat, texImage->Width); |
| _mesa_get_format_block_size(texImage->TexFormat, &bw, &bh); |
| |
| assert(x % bw == 0); |
| assert(y % bh == 0); |
| |
| if (!swImage->Buffer) { |
| /* probably ran out of memory when allocating tex mem */ |
| *mapOut = NULL; |
| return; |
| } |
| |
| /* This function can only be used with a swrast-allocated buffer, in which |
| * case ImageSlices is populated with pointers into Buffer. |
| */ |
| assert(swImage->Buffer); |
| assert(swImage->Buffer == swImage->ImageSlices[0]); |
| |
| assert(slice < texture_slices(texImage)); |
| map = swImage->ImageSlices[slice]; |
| |
| /* apply x/y offset to map address */ |
| map += stride * (y / bh) + texelSize * (x / bw); |
| |
| *mapOut = map; |
| *rowStrideOut = stride; |
| } |
| |
| void |
| _swrast_unmap_teximage(struct gl_context *ctx, |
| struct gl_texture_image *texImage, |
| GLuint slice) |
| { |
| /* nop */ |
| } |
| |
| |
| void |
| _swrast_map_texture(struct gl_context *ctx, struct gl_texture_object *texObj) |
| { |
| const GLuint faces = _mesa_num_tex_faces(texObj->Target); |
| GLuint face, level; |
| |
| for (face = 0; face < faces; face++) { |
| for (level = texObj->BaseLevel; level < MAX_TEXTURE_LEVELS; level++) { |
| struct gl_texture_image *texImage = texObj->Image[face][level]; |
| struct swrast_texture_image *swImage = swrast_texture_image(texImage); |
| unsigned int i; |
| |
| if (!texImage) |
| continue; |
| |
| /* In the case of a swrast-allocated texture buffer, the ImageSlices |
| * and RowStride are always available. |
| */ |
| if (swImage->Buffer) { |
| assert(swImage->ImageSlices[0] == swImage->Buffer); |
| continue; |
| } |
| |
| for (i = 0; i < texture_slices(texImage); i++) { |
| GLubyte *map; |
| GLint rowStride; |
| |
| if (swImage->ImageSlices[i]) |
| continue; |
| |
| ctx->Driver.MapTextureImage(ctx, texImage, i, |
| 0, 0, |
| texImage->Width, texImage->Height, |
| GL_MAP_READ_BIT | GL_MAP_WRITE_BIT, |
| &map, &rowStride); |
| |
| swImage->ImageSlices[i] = map; |
| /* A swrast-using driver has to return the same rowstride for |
| * every slice of the same texture, since we don't track them |
| * separately. |
| */ |
| if (i == 0) |
| swImage->RowStride = rowStride; |
| else |
| assert(swImage->RowStride == rowStride); |
| } |
| } |
| } |
| } |
| |
| |
| void |
| _swrast_unmap_texture(struct gl_context *ctx, struct gl_texture_object *texObj) |
| { |
| const GLuint faces = _mesa_num_tex_faces(texObj->Target); |
| GLuint face, level; |
| |
| for (face = 0; face < faces; face++) { |
| for (level = texObj->BaseLevel; level < MAX_TEXTURE_LEVELS; level++) { |
| struct gl_texture_image *texImage = texObj->Image[face][level]; |
| struct swrast_texture_image *swImage = swrast_texture_image(texImage); |
| unsigned int i; |
| |
| if (!texImage) |
| continue; |
| |
| if (swImage->Buffer) |
| return; |
| |
| for (i = 0; i < texture_slices(texImage); i++) { |
| if (swImage->ImageSlices[i]) { |
| ctx->Driver.UnmapTextureImage(ctx, texImage, i); |
| swImage->ImageSlices[i] = NULL; |
| } |
| } |
| } |
| } |
| } |
| |
| |
| /** |
| * Map all textures for reading prior to software rendering. |
| */ |
| void |
| _swrast_map_textures(struct gl_context *ctx) |
| { |
| GLbitfield enabledUnits = ctx->Texture._EnabledUnits; |
| |
| /* loop over enabled texture units */ |
| while (enabledUnits) { |
| GLuint unit = ffs(enabledUnits) - 1; |
| struct gl_texture_object *texObj = ctx->Texture.Unit[unit]._Current; |
| |
| _swrast_map_texture(ctx, texObj); |
| |
| enabledUnits &= ~(1 << unit); |
| } |
| } |
| |
| |
| /** |
| * Unmap all textures for reading prior to software rendering. |
| */ |
| void |
| _swrast_unmap_textures(struct gl_context *ctx) |
| { |
| GLbitfield enabledUnits = ctx->Texture._EnabledUnits; |
| |
| /* loop over enabled texture units */ |
| while (enabledUnits) { |
| GLuint unit = ffs(enabledUnits) - 1; |
| struct gl_texture_object *texObj = ctx->Texture.Unit[unit]._Current; |
| |
| _swrast_unmap_texture(ctx, texObj); |
| |
| enabledUnits &= ~(1 << unit); |
| } |
| } |