2 * Mesa 3-D graphics library
4 * Copyright (C) 2009 VMware, Inc. All Rights Reserved.
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice shall be included
14 * in all copies or substantial portions of the Software.
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
17 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
22 * OTHER DEALINGS IN THE SOFTWARE.
26 * Meta operations. Some GL operations can be expressed in terms of
27 * other GL operations. For example, glBlitFramebuffer() can be done
28 * with texture mapping and glClear() can be done with polygon rendering.
33 #include "main/arrayobj.h"
34 #include "main/buffers.h"
35 #include "main/enums.h"
36 #include "main/enable.h"
37 #include "main/fbobject.h"
38 #include "main/macros.h"
39 #include "main/mipmap.h"
40 #include "main/teximage.h"
41 #include "main/texobj.h"
42 #include "main/texparam.h"
43 #include "main/varray.h"
44 #include "main/viewport.h"
45 #include "drivers/common/meta.h"
48 * Bind a particular texture level/layer to mipmap->FBO's GL_COLOR_ATTACHMENT0.
51 bind_fbo_image(struct gl_texture_object
*texObj
, GLenum target
, GLuint level
)
55 _mesa_FramebufferTexture1D(GL_FRAMEBUFFER
,
62 _mesa_FramebufferTexture3D(GL_FRAMEBUFFER
,
67 0); /* XXX: Unfinished */
69 default: /* 2D / cube */
70 _mesa_FramebufferTexture2D(GL_FRAMEBUFFER
,
79 * Check if the call to _mesa_meta_GenerateMipmap() will require a
80 * software fallback. The fallback path will require that the texture
82 * \return GL_TRUE if a fallback is needed, GL_FALSE otherwise
85 fallback_required(struct gl_context
*ctx
, GLenum target
,
86 struct gl_texture_object
*texObj
)
88 const GLuint fboSave
= ctx
->DrawBuffer
->Name
;
89 struct gen_mipmap_state
*mipmap
= &ctx
->Meta
->Mipmap
;
90 struct gl_texture_image
*baseImage
;
94 /* check for fallbacks */
95 if (target
== GL_TEXTURE_3D
||
96 target
== GL_TEXTURE_1D_ARRAY
||
97 target
== GL_TEXTURE_2D_ARRAY
) {
98 _mesa_perf_debug(ctx
, MESA_DEBUG_SEVERITY_HIGH
,
99 "glGenerateMipmap() to %s target\n",
100 _mesa_lookup_enum_by_nr(target
));
104 srcLevel
= texObj
->BaseLevel
;
105 baseImage
= _mesa_select_tex_image(ctx
, texObj
, target
, srcLevel
);
107 _mesa_perf_debug(ctx
, MESA_DEBUG_SEVERITY_HIGH
,
108 "glGenerateMipmap() couldn't find base teximage\n");
112 if (_mesa_is_format_compressed(baseImage
->TexFormat
)) {
113 _mesa_perf_debug(ctx
, MESA_DEBUG_SEVERITY_HIGH
,
114 "glGenerateMipmap() with %s format\n",
115 _mesa_get_format_name(baseImage
->TexFormat
));
119 if (_mesa_get_format_color_encoding(baseImage
->TexFormat
) == GL_SRGB
&&
120 !ctx
->Extensions
.EXT_texture_sRGB_decode
) {
121 /* The texture format is sRGB but we can't turn off sRGB->linear
122 * texture sample conversion. So we won't be able to generate the
123 * right colors when rendering. Need to use a fallback.
125 _mesa_perf_debug(ctx
, MESA_DEBUG_SEVERITY_HIGH
,
126 "glGenerateMipmap() of sRGB texture without "
132 * Test that we can actually render in the texture's format.
135 _mesa_GenFramebuffers(1, &mipmap
->FBO
);
136 _mesa_BindFramebuffer(GL_FRAMEBUFFER_EXT
, mipmap
->FBO
);
138 bind_fbo_image(texObj
, target
, srcLevel
);
140 status
= _mesa_CheckFramebufferStatus(GL_FRAMEBUFFER_EXT
);
142 _mesa_BindFramebuffer(GL_FRAMEBUFFER_EXT
, fboSave
);
144 if (status
!= GL_FRAMEBUFFER_COMPLETE_EXT
) {
145 _mesa_perf_debug(ctx
, MESA_DEBUG_SEVERITY_HIGH
,
146 "glGenerateMipmap() got incomplete FBO\n");
154 _mesa_meta_glsl_generate_mipmap_cleanup(struct gen_mipmap_state
*mipmap
)
156 if (mipmap
->VAO
== 0)
158 _mesa_DeleteVertexArrays(1, &mipmap
->VAO
);
160 _mesa_DeleteBuffers(1, &mipmap
->VBO
);
163 _mesa_meta_blit_shader_table_cleanup(&mipmap
->shaders
);
167 * Called via ctx->Driver.GenerateMipmap()
168 * Note: We don't yet support 3D textures, 1D/2D array textures or texture
172 _mesa_meta_GenerateMipmap(struct gl_context
*ctx
, GLenum target
,
173 struct gl_texture_object
*texObj
)
175 struct gen_mipmap_state
*mipmap
= &ctx
->Meta
->Mipmap
;
176 struct vertex verts
[4];
177 const GLuint baseLevel
= texObj
->BaseLevel
;
178 const GLuint maxLevel
= texObj
->MaxLevel
;
179 const GLint maxLevelSave
= texObj
->MaxLevel
;
180 const GLboolean genMipmapSave
= texObj
->GenerateMipmap
;
181 const GLuint fboSave
= ctx
->DrawBuffer
->Name
;
182 const GLuint currentTexUnitSave
= ctx
->Texture
.CurrentUnit
;
183 const GLboolean use_glsl_version
= ctx
->Extensions
.ARB_vertex_shader
&&
184 ctx
->Extensions
.ARB_fragment_shader
;
187 const GLint slice
= 0;
190 if (fallback_required(ctx
, target
, texObj
)) {
191 _mesa_generate_mipmap(ctx
, target
, texObj
);
195 if (target
>= GL_TEXTURE_CUBE_MAP_POSITIVE_X
&&
196 target
<= GL_TEXTURE_CUBE_MAP_NEGATIVE_Z
) {
198 target
= GL_TEXTURE_CUBE_MAP
;
203 _mesa_meta_begin(ctx
, MESA_META_ALL
);
205 /* Choose between glsl version and fixed function version of
206 * GenerateMipmap function.
208 if (use_glsl_version
) {
209 _mesa_meta_setup_vertex_objects(&mipmap
->VAO
, &mipmap
->VBO
, true,
211 _mesa_meta_setup_blit_shader(ctx
, target
, &mipmap
->shaders
);
213 _mesa_meta_setup_ff_tnl_for_blit(&mipmap
->VAO
, &mipmap
->VBO
, 3);
214 _mesa_set_enable(ctx
, target
, GL_TRUE
);
217 samplerSave
= ctx
->Texture
.Unit
[ctx
->Texture
.CurrentUnit
].Sampler
?
218 ctx
->Texture
.Unit
[ctx
->Texture
.CurrentUnit
].Sampler
->Name
: 0;
220 if (currentTexUnitSave
!= 0)
221 _mesa_BindTexture(target
, texObj
->Name
);
223 if (!mipmap
->Sampler
) {
224 _mesa_GenSamplers(1, &mipmap
->Sampler
);
225 _mesa_BindSampler(ctx
->Texture
.CurrentUnit
, mipmap
->Sampler
);
227 _mesa_SamplerParameteri(mipmap
->Sampler
,
228 GL_TEXTURE_MIN_FILTER
,
229 GL_LINEAR_MIPMAP_LINEAR
);
230 _mesa_SamplerParameteri(mipmap
->Sampler
, GL_TEXTURE_MAG_FILTER
, GL_LINEAR
);
231 _mesa_SamplerParameteri(mipmap
->Sampler
, GL_TEXTURE_WRAP_S
, GL_CLAMP_TO_EDGE
);
232 _mesa_SamplerParameteri(mipmap
->Sampler
, GL_TEXTURE_WRAP_T
, GL_CLAMP_TO_EDGE
);
233 _mesa_SamplerParameteri(mipmap
->Sampler
, GL_TEXTURE_WRAP_R
, GL_CLAMP_TO_EDGE
);
235 /* We don't want to encode or decode sRGB values; treat them as linear.
236 * This is not technically correct for GLES3 but we don't get any API
237 * error at the moment.
239 if (ctx
->Extensions
.EXT_texture_sRGB_decode
) {
240 _mesa_SamplerParameteri(mipmap
->Sampler
, GL_TEXTURE_SRGB_DECODE_EXT
,
244 _mesa_BindSampler(ctx
->Texture
.CurrentUnit
, mipmap
->Sampler
);
247 assert(mipmap
->FBO
!= 0);
248 _mesa_BindFramebuffer(GL_FRAMEBUFFER_EXT
, mipmap
->FBO
);
250 _mesa_TexParameteri(target
, GL_GENERATE_MIPMAP
, GL_FALSE
);
252 /* Silence valgrind warnings about reading uninitialized stack. */
253 memset(verts
, 0, sizeof(verts
));
255 /* Setup texture coordinates */
256 _mesa_meta_setup_texture_coords(faceTarget
,
258 0, 0, 1, /* width, height never used here */
264 /* setup vertex positions */
274 /* upload vertex data */
275 _mesa_BufferData(GL_ARRAY_BUFFER_ARB
, sizeof(verts
),
276 verts
, GL_DYNAMIC_DRAW_ARB
);
278 /* texture is already locked, unlock now */
279 _mesa_unlock_texture(ctx
, texObj
);
281 for (dstLevel
= baseLevel
+ 1; dstLevel
<= maxLevel
; dstLevel
++) {
282 const struct gl_texture_image
*srcImage
;
283 const GLuint srcLevel
= dstLevel
- 1;
284 GLsizei srcWidth
, srcHeight
, srcDepth
;
285 GLsizei dstWidth
, dstHeight
, dstDepth
;
287 srcImage
= _mesa_select_tex_image(ctx
, texObj
, faceTarget
, srcLevel
);
288 assert(srcImage
->Border
== 0);
291 srcWidth
= srcImage
->Width
;
292 srcHeight
= srcImage
->Height
;
293 srcDepth
= srcImage
->Depth
;
296 dstWidth
= minify(srcWidth
, 1);
297 dstHeight
= minify(srcHeight
, 1);
298 dstDepth
= minify(srcDepth
, 1);
300 if (dstWidth
== srcImage
->Width
&&
301 dstHeight
== srcImage
->Height
&&
302 dstDepth
== srcImage
->Depth
) {
307 /* Allocate storage for the destination mipmap image(s) */
309 /* Set MaxLevel large enough to hold the new level when we allocate it */
310 _mesa_TexParameteri(target
, GL_TEXTURE_MAX_LEVEL
, dstLevel
);
312 if (!_mesa_prepare_mipmap_level(ctx
, texObj
, dstLevel
,
313 dstWidth
, dstHeight
, dstDepth
,
315 srcImage
->InternalFormat
,
316 srcImage
->TexFormat
)) {
317 /* All done. We either ran out of memory or we would go beyond the
318 * last valid level of an immutable texture if we continued.
323 /* limit minification to src level */
324 _mesa_TexParameteri(target
, GL_TEXTURE_MAX_LEVEL
, srcLevel
);
326 bind_fbo_image(texObj
, faceTarget
, dstLevel
);
328 _mesa_DrawBuffer(GL_COLOR_ATTACHMENT0_EXT
);
331 if (_mesa_CheckFramebufferStatus(GL_FRAMEBUFFER
) !=
332 GL_FRAMEBUFFER_COMPLETE
) {
333 _mesa_problem(ctx
, "Unexpected incomplete framebuffer in "
334 "_mesa_meta_GenerateMipmap()");
338 assert(dstWidth
== ctx
->DrawBuffer
->Width
);
339 assert(dstHeight
== ctx
->DrawBuffer
->Height
);
342 _mesa_set_viewport(ctx
, 0, 0, 0, dstWidth
, dstHeight
);
344 _mesa_DrawArrays(GL_TRIANGLE_FAN
, 0, 4);
347 _mesa_lock_texture(ctx
, texObj
); /* relock */
349 _mesa_BindSampler(ctx
->Texture
.CurrentUnit
, samplerSave
);
353 _mesa_TexParameteri(target
, GL_TEXTURE_MAX_LEVEL
, maxLevelSave
);
355 _mesa_TexParameteri(target
, GL_GENERATE_MIPMAP
, genMipmapSave
);
357 _mesa_BindFramebuffer(GL_FRAMEBUFFER_EXT
, fboSave
);