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321 lines
9.6 KiB
C
321 lines
9.6 KiB
C
/*
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* Mesa 3-D graphics library
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*
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* Copyright (C) 2011 VMware, Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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/**
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* Functions for mapping/unmapping texture images.
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*/
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#include <precomp.h>
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/**
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* Allocate a new swrast_texture_image (a subclass of gl_texture_image).
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* Called via ctx->Driver.NewTextureImage().
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*/
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struct gl_texture_image *
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_swrast_new_texture_image( struct gl_context *ctx )
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{
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(void) ctx;
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return (struct gl_texture_image *) CALLOC_STRUCT(swrast_texture_image);
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}
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/**
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* Free a swrast_texture_image (a subclass of gl_texture_image).
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* Called via ctx->Driver.DeleteTextureImage().
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*/
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void
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_swrast_delete_texture_image(struct gl_context *ctx,
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struct gl_texture_image *texImage)
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{
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/* Nothing special for the subclass yet */
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_mesa_delete_texture_image(ctx, texImage);
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}
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/**
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* Called via ctx->Driver.AllocTextureImageBuffer()
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*/
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GLboolean
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_swrast_alloc_texture_image_buffer(struct gl_context *ctx,
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struct gl_texture_image *texImage,
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gl_format format, GLsizei width,
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GLsizei height, GLsizei depth)
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{
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struct swrast_texture_image *swImg = swrast_texture_image(texImage);
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GLuint bytes = _mesa_format_image_size(format, width, height, depth);
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GLuint i;
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/* This _should_ be true (revisit if these ever fail) */
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assert(texImage->Width == width);
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assert(texImage->Height == height);
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assert(texImage->Depth == depth);
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assert(!swImg->Buffer);
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swImg->Buffer = _mesa_align_malloc(bytes, 512);
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if (!swImg->Buffer)
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return GL_FALSE;
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/* RowStride and ImageOffsets[] describe how to address texels in 'Data' */
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swImg->RowStride = width;
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/* Allocate the ImageOffsets array and initialize to typical values.
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* We allocate the array for 1D/2D textures too in order to avoid special-
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* case code in the texstore routines.
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*/
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swImg->ImageOffsets = (GLuint *) malloc(depth * sizeof(GLuint));
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if (!swImg->ImageOffsets)
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return GL_FALSE;
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for (i = 0; i < depth; i++) {
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swImg->ImageOffsets[i] = i * width * height;
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}
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_swrast_init_texture_image(texImage, width, height, depth);
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return GL_TRUE;
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}
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/**
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* Code that overrides ctx->Driver.AllocTextureImageBuffer may use this to
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* initialize the fields of swrast_texture_image without allocating the image
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* buffer or initializing ImageOffsets or RowStride.
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*
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* Returns GL_TRUE on success, GL_FALSE on memory allocation failure.
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*/
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void
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_swrast_init_texture_image(struct gl_texture_image *texImage, GLsizei width,
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GLsizei height, GLsizei depth)
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{
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struct swrast_texture_image *swImg = swrast_texture_image(texImage);
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if ((width == 1 || _mesa_is_pow_two(texImage->Width2)) &&
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(height == 1 || _mesa_is_pow_two(texImage->Height2)) &&
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(depth == 1 || _mesa_is_pow_two(texImage->Depth2)))
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swImg->_IsPowerOfTwo = GL_TRUE;
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else
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swImg->_IsPowerOfTwo = GL_FALSE;
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/* Compute Width/Height/DepthScale for mipmap lod computation */
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swImg->WidthScale = (GLfloat) texImage->Width;
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swImg->HeightScale = (GLfloat) texImage->Height;
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swImg->DepthScale = (GLfloat) texImage->Depth;
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}
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/**
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* Called via ctx->Driver.FreeTextureImageBuffer()
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*/
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void
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_swrast_free_texture_image_buffer(struct gl_context *ctx,
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struct gl_texture_image *texImage)
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{
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struct swrast_texture_image *swImage = swrast_texture_image(texImage);
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if (swImage->Buffer) {
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_mesa_align_free(swImage->Buffer);
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swImage->Buffer = NULL;
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}
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if (swImage->ImageOffsets) {
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free(swImage->ImageOffsets);
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swImage->ImageOffsets = NULL;
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}
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}
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/**
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* Error checking for debugging only.
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*/
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static void
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_mesa_check_map_teximage(struct gl_texture_image *texImage,
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GLuint slice, GLuint x, GLuint y, GLuint w, GLuint h)
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{
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if (texImage->TexObject->Target == GL_TEXTURE_1D)
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assert(y == 0 && h == 1);
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assert(x < texImage->Width || texImage->Width == 0);
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assert(y < texImage->Height || texImage->Height == 0);
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assert(x + w <= texImage->Width);
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assert(y + h <= texImage->Height);
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}
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/**
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* Map a 2D slice of a texture image into user space.
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* (x,y,w,h) defines a region of interest (ROI). Reading/writing texels
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* outside of the ROI is undefined.
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*
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* \param texImage the texture image
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* \param slice the 3D image slice or array texture slice
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* \param x, y, w, h region of interest
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* \param mode bitmask of GL_MAP_READ_BIT, GL_MAP_WRITE_BIT
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* \param mapOut returns start of mapping of region of interest
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* \param rowStrideOut returns row stride (in bytes)
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*/
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void
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_swrast_map_teximage(struct gl_context *ctx,
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struct gl_texture_image *texImage,
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GLuint slice,
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GLuint x, GLuint y, GLuint w, GLuint h,
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GLbitfield mode,
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GLubyte **mapOut,
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GLint *rowStrideOut)
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{
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struct swrast_texture_image *swImage = swrast_texture_image(texImage);
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GLubyte *map;
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GLint stride, texelSize;
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GLuint bw, bh;
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_mesa_check_map_teximage(texImage, slice, x, y, w, h);
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texelSize = _mesa_get_format_bytes(texImage->TexFormat);
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stride = _mesa_format_row_stride(texImage->TexFormat, texImage->Width);
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_mesa_get_format_block_size(texImage->TexFormat, &bw, &bh);
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assert(x % bw == 0);
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assert(y % bh == 0);
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if (!swImage->Buffer) {
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/* probably ran out of memory when allocating tex mem */
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*mapOut = NULL;
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return;
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}
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map = swImage->Buffer;
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/* apply x/y offset to map address */
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map += stride * (y / bh) + texelSize * (x / bw);
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*mapOut = map;
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*rowStrideOut = stride;
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}
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void
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_swrast_unmap_teximage(struct gl_context *ctx,
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struct gl_texture_image *texImage,
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GLuint slice)
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{
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/* nop */
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}
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void
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_swrast_map_texture(struct gl_context *ctx, struct gl_texture_object *texObj)
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{
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const GLuint faces = texObj->Target == GL_TEXTURE_CUBE_MAP ? 6 : 1;
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GLuint face, level;
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for (face = 0; face < faces; face++) {
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for (level = texObj->BaseLevel; level < MAX_TEXTURE_LEVELS; level++) {
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struct gl_texture_image *texImage = texObj->Image[face][level];
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if (texImage) {
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struct swrast_texture_image *swImage =
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swrast_texture_image(texImage);
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/* XXX we'll eventually call _swrast_map_teximage() here */
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swImage->Map = swImage->Buffer;
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}
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}
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}
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}
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void
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_swrast_unmap_texture(struct gl_context *ctx, struct gl_texture_object *texObj)
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{
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const GLuint faces = texObj->Target == GL_TEXTURE_CUBE_MAP ? 6 : 1;
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GLuint face, level;
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for (face = 0; face < faces; face++) {
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for (level = texObj->BaseLevel; level < MAX_TEXTURE_LEVELS; level++) {
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struct gl_texture_image *texImage = texObj->Image[face][level];
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if (texImage) {
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struct swrast_texture_image *swImage
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= swrast_texture_image(texImage);
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/* XXX we'll eventually call _swrast_unmap_teximage() here */
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swImage->Map = NULL;
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}
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}
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}
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}
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/**
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* Map all textures for reading prior to software rendering.
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*/
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void
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_swrast_map_textures(struct gl_context *ctx)
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{
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if (ctx->Texture._Enabled) {
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struct gl_texture_object *texObj = ctx->Texture.Unit._Current;
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_swrast_map_texture(ctx, texObj);
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}
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}
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/**
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* Unmap all textures for reading prior to software rendering.
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*/
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void
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_swrast_unmap_textures(struct gl_context *ctx)
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{
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if(ctx->Texture._Enabled) {
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struct gl_texture_object *texObj = ctx->Texture.Unit._Current;
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_swrast_unmap_texture(ctx, texObj);
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}
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}
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/**
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* Called via ctx->Driver.AllocTextureStorage()
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* Just have to allocate memory for the texture images.
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*/
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GLboolean
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_swrast_AllocTextureStorage(struct gl_context *ctx,
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struct gl_texture_object *texObj,
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GLsizei levels, GLsizei width,
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GLsizei height, GLsizei depth)
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{
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const GLint numFaces = (texObj->Target == GL_TEXTURE_CUBE_MAP) ? 6 : 1;
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GLint face, level;
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for (face = 0; face < numFaces; face++) {
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for (level = 0; level < levels; level++) {
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struct gl_texture_image *texImage = texObj->Image[face][level];
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if (!_swrast_alloc_texture_image_buffer(ctx, texImage,
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texImage->TexFormat,
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texImage->Width,
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texImage->Height,
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texImage->Depth)) {
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return GL_FALSE;
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}
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}
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}
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return GL_TRUE;
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}
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