2 * Mesa 3-D graphics library
4 * Copyright (C) 2011 VMware, Inc.
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25 * Functions for mapping/unmapping texture images.
29 #include "main/context.h"
30 #include "main/fbobject.h"
31 #include "main/teximage.h"
32 #include "swrast/swrast.h"
33 #include "swrast/s_context.h"
37 * Allocate a new swrast_texture_image (a subclass of gl_texture_image).
38 * Called via ctx->Driver.NewTextureImage().
40 struct gl_texture_image *
41 _swrast_new_texture_image( struct gl_context *ctx )
44 return (struct gl_texture_image *) CALLOC_STRUCT(swrast_texture_image);
49 * Free a swrast_texture_image (a subclass of gl_texture_image).
50 * Called via ctx->Driver.DeleteTextureImage().
53 _swrast_delete_texture_image(struct gl_context *ctx,
54 struct gl_texture_image *texImage)
56 /* Nothing special for the subclass yet */
57 _mesa_delete_texture_image(ctx, texImage);
62 * Called via ctx->Driver.AllocTextureImageBuffer()
65 _swrast_alloc_texture_image_buffer(struct gl_context *ctx,
66 struct gl_texture_image *texImage,
67 gl_format format, GLsizei width,
68 GLsizei height, GLsizei depth)
70 struct swrast_texture_image *swImg = swrast_texture_image(texImage);
71 GLuint bytes = _mesa_format_image_size(format, width, height, depth);
73 /* This _should_ be true (revisit if these ever fail) */
74 assert(texImage->Width == width);
75 assert(texImage->Height == height);
76 assert(texImage->Depth == depth);
78 assert(!texImage->Data);
79 texImage->Data = _mesa_align_malloc(bytes, 512);
81 if ((width == 1 || _mesa_is_pow_two(texImage->Width2)) &&
82 (height == 1 || _mesa_is_pow_two(texImage->Height2)) &&
83 (depth == 1 || _mesa_is_pow_two(texImage->Depth2)))
84 swImg->_IsPowerOfTwo = GL_TRUE;
86 swImg->_IsPowerOfTwo = GL_FALSE;
88 /* Compute Width/Height/DepthScale for mipmap lod computation */
89 if (texImage->TexObject->Target == GL_TEXTURE_RECTANGLE_NV) {
90 /* scale = 1.0 since texture coords directly map to texels */
91 swImg->WidthScale = 1.0;
92 swImg->HeightScale = 1.0;
93 swImg->DepthScale = 1.0;
96 swImg->WidthScale = (GLfloat) texImage->Width;
97 swImg->HeightScale = (GLfloat) texImage->Height;
98 swImg->DepthScale = (GLfloat) texImage->Depth;
101 return texImage->Data != NULL;
106 * Called via ctx->Driver.FreeTextureImageBuffer()
109 _swrast_free_texture_image_buffer(struct gl_context *ctx,
110 struct gl_texture_image *texImage)
112 if (texImage->Data && !texImage->IsClientData) {
113 _mesa_align_free(texImage->Data);
116 texImage->Data = NULL;
121 * Error checking for debugging only.
124 _mesa_check_map_teximage(struct gl_texture_image *texImage,
125 GLuint slice, GLuint x, GLuint y, GLuint w, GLuint h)
128 if (texImage->TexObject->Target == GL_TEXTURE_1D)
129 assert(y == 0 && h == 1);
131 assert(x < texImage->Width || texImage->Width == 0);
132 assert(y < texImage->Height || texImage->Height == 0);
133 assert(x + w <= texImage->Width);
134 assert(y + h <= texImage->Height);
138 * Map a 2D slice of a texture image into user space.
139 * (x,y,w,h) defines a region of interest (ROI). Reading/writing texels
140 * outside of the ROI is undefined.
142 * \param texImage the texture image
143 * \param slice the 3D image slice or array texture slice
144 * \param x, y, w, h region of interest
145 * \param mode bitmask of GL_MAP_READ_BIT, GL_MAP_WRITE_BIT
146 * \param mapOut returns start of mapping of region of interest
147 * \param rowStrideOut returns row stride (in bytes)
150 _swrast_map_teximage(struct gl_context *ctx,
151 struct gl_texture_image *texImage,
153 GLuint x, GLuint y, GLuint w, GLuint h,
159 GLint stride, texelSize;
162 _mesa_check_map_teximage(texImage, slice, x, y, w, h);
164 texelSize = _mesa_get_format_bytes(texImage->TexFormat);
165 stride = _mesa_format_row_stride(texImage->TexFormat, texImage->Width);
166 _mesa_get_format_block_size(texImage->TexFormat, &bw, &bh);
168 assert(texImage->Data);
170 map = texImage->Data;
172 if (texImage->TexObject->Target == GL_TEXTURE_3D ||
173 texImage->TexObject->Target == GL_TEXTURE_2D_ARRAY) {
174 GLuint sliceSize = _mesa_format_image_size(texImage->TexFormat,
178 assert(slice < texImage->Depth);
179 map += slice * sliceSize;
182 /* apply x/y offset to map address */
183 map += stride * (y / bh) + texelSize * (x / bw);
186 *rowStrideOut = stride;
190 _swrast_unmap_teximage(struct gl_context *ctx,
191 struct gl_texture_image *texImage,