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
,
52 GLuint level
, GLuint layer
)
56 _mesa_FramebufferTexture1D(GL_FRAMEBUFFER
,
62 case GL_TEXTURE_1D_ARRAY
:
63 case GL_TEXTURE_2D_ARRAY
:
65 _mesa_FramebufferTextureLayer(GL_FRAMEBUFFER
,
71 default: /* 2D / cube */
72 _mesa_FramebufferTexture2D(GL_FRAMEBUFFER
,
81 * Check if the call to _mesa_meta_GenerateMipmap() will require a
82 * software fallback. The fallback path will require that the texture
84 * \return GL_TRUE if a fallback is needed, GL_FALSE otherwise
87 fallback_required(struct gl_context
*ctx
, GLenum target
,
88 struct gl_texture_object
*texObj
)
90 const GLuint fboSave
= ctx
->DrawBuffer
->Name
;
91 struct gen_mipmap_state
*mipmap
= &ctx
->Meta
->Mipmap
;
92 struct gl_texture_image
*baseImage
;
96 /* check for fallbacks */
97 if (target
== GL_TEXTURE_3D
||
98 target
== GL_TEXTURE_1D_ARRAY
||
99 target
== GL_TEXTURE_2D_ARRAY
) {
100 _mesa_perf_debug(ctx
, MESA_DEBUG_SEVERITY_HIGH
,
101 "glGenerateMipmap() to %s target\n",
102 _mesa_lookup_enum_by_nr(target
));
106 srcLevel
= texObj
->BaseLevel
;
107 baseImage
= _mesa_select_tex_image(ctx
, texObj
, target
, srcLevel
);
109 _mesa_perf_debug(ctx
, MESA_DEBUG_SEVERITY_HIGH
,
110 "glGenerateMipmap() couldn't find base teximage\n");
114 if (_mesa_is_format_compressed(baseImage
->TexFormat
)) {
115 _mesa_perf_debug(ctx
, MESA_DEBUG_SEVERITY_HIGH
,
116 "glGenerateMipmap() with %s format\n",
117 _mesa_get_format_name(baseImage
->TexFormat
));
121 if (_mesa_get_format_color_encoding(baseImage
->TexFormat
) == GL_SRGB
&&
122 !ctx
->Extensions
.EXT_texture_sRGB_decode
) {
123 /* The texture format is sRGB but we can't turn off sRGB->linear
124 * texture sample conversion. So we won't be able to generate the
125 * right colors when rendering. Need to use a fallback.
127 _mesa_perf_debug(ctx
, MESA_DEBUG_SEVERITY_HIGH
,
128 "glGenerateMipmap() of sRGB texture without "
134 * Test that we can actually render in the texture's format.
137 _mesa_GenFramebuffers(1, &mipmap
->FBO
);
138 _mesa_BindFramebuffer(GL_FRAMEBUFFER_EXT
, mipmap
->FBO
);
140 bind_fbo_image(texObj
, target
, srcLevel
, 0);
142 status
= _mesa_CheckFramebufferStatus(GL_FRAMEBUFFER_EXT
);
144 _mesa_BindFramebuffer(GL_FRAMEBUFFER_EXT
, fboSave
);
146 if (status
!= GL_FRAMEBUFFER_COMPLETE_EXT
) {
147 _mesa_perf_debug(ctx
, MESA_DEBUG_SEVERITY_HIGH
,
148 "glGenerateMipmap() got incomplete FBO\n");
156 _mesa_meta_glsl_generate_mipmap_cleanup(struct gen_mipmap_state
*mipmap
)
158 if (mipmap
->VAO
== 0)
160 _mesa_DeleteVertexArrays(1, &mipmap
->VAO
);
162 _mesa_DeleteBuffers(1, &mipmap
->VBO
);
165 _mesa_meta_blit_shader_table_cleanup(&mipmap
->shaders
);
169 * Called via ctx->Driver.GenerateMipmap()
170 * Note: We don't yet support 3D textures, 1D/2D array textures or texture
174 _mesa_meta_GenerateMipmap(struct gl_context
*ctx
, GLenum target
,
175 struct gl_texture_object
*texObj
)
177 struct gen_mipmap_state
*mipmap
= &ctx
->Meta
->Mipmap
;
178 struct vertex verts
[4];
179 const GLuint baseLevel
= texObj
->BaseLevel
;
180 const GLuint maxLevel
= texObj
->MaxLevel
;
181 const GLint maxLevelSave
= texObj
->MaxLevel
;
182 const GLboolean genMipmapSave
= texObj
->GenerateMipmap
;
183 const GLuint fboSave
= ctx
->DrawBuffer
->Name
;
184 const GLuint currentTexUnitSave
= ctx
->Texture
.CurrentUnit
;
185 const GLboolean use_glsl_version
= ctx
->Extensions
.ARB_vertex_shader
&&
186 ctx
->Extensions
.ARB_fragment_shader
;
189 const GLint slice
= 0;
192 if (fallback_required(ctx
, target
, texObj
)) {
193 _mesa_generate_mipmap(ctx
, target
, texObj
);
197 if (target
>= GL_TEXTURE_CUBE_MAP_POSITIVE_X
&&
198 target
<= GL_TEXTURE_CUBE_MAP_NEGATIVE_Z
) {
200 target
= GL_TEXTURE_CUBE_MAP
;
205 _mesa_meta_begin(ctx
, MESA_META_ALL
);
207 /* Choose between glsl version and fixed function version of
208 * GenerateMipmap function.
210 if (use_glsl_version
) {
211 _mesa_meta_setup_vertex_objects(&mipmap
->VAO
, &mipmap
->VBO
, true,
213 _mesa_meta_setup_blit_shader(ctx
, target
, &mipmap
->shaders
);
215 _mesa_meta_setup_ff_tnl_for_blit(&mipmap
->VAO
, &mipmap
->VBO
, 3);
216 _mesa_set_enable(ctx
, target
, GL_TRUE
);
219 samplerSave
= ctx
->Texture
.Unit
[ctx
->Texture
.CurrentUnit
].Sampler
?
220 ctx
->Texture
.Unit
[ctx
->Texture
.CurrentUnit
].Sampler
->Name
: 0;
222 if (currentTexUnitSave
!= 0)
223 _mesa_BindTexture(target
, texObj
->Name
);
225 if (!mipmap
->Sampler
) {
226 _mesa_GenSamplers(1, &mipmap
->Sampler
);
227 _mesa_BindSampler(ctx
->Texture
.CurrentUnit
, mipmap
->Sampler
);
229 _mesa_SamplerParameteri(mipmap
->Sampler
,
230 GL_TEXTURE_MIN_FILTER
,
231 GL_LINEAR_MIPMAP_LINEAR
);
232 _mesa_SamplerParameteri(mipmap
->Sampler
, GL_TEXTURE_MAG_FILTER
, GL_LINEAR
);
233 _mesa_SamplerParameteri(mipmap
->Sampler
, GL_TEXTURE_WRAP_S
, GL_CLAMP_TO_EDGE
);
234 _mesa_SamplerParameteri(mipmap
->Sampler
, GL_TEXTURE_WRAP_T
, GL_CLAMP_TO_EDGE
);
235 _mesa_SamplerParameteri(mipmap
->Sampler
, GL_TEXTURE_WRAP_R
, GL_CLAMP_TO_EDGE
);
237 /* We don't want to encode or decode sRGB values; treat them as linear.
238 * This is not technically correct for GLES3 but we don't get any API
239 * error at the moment.
241 if (ctx
->Extensions
.EXT_texture_sRGB_decode
) {
242 _mesa_SamplerParameteri(mipmap
->Sampler
, GL_TEXTURE_SRGB_DECODE_EXT
,
246 _mesa_BindSampler(ctx
->Texture
.CurrentUnit
, mipmap
->Sampler
);
249 assert(mipmap
->FBO
!= 0);
250 _mesa_BindFramebuffer(GL_FRAMEBUFFER_EXT
, mipmap
->FBO
);
252 _mesa_TexParameteri(target
, GL_GENERATE_MIPMAP
, GL_FALSE
);
254 /* Silence valgrind warnings about reading uninitialized stack. */
255 memset(verts
, 0, sizeof(verts
));
257 /* Setup texture coordinates */
258 _mesa_meta_setup_texture_coords(faceTarget
,
260 0, 0, 1, /* width, height never used here */
266 /* setup vertex positions */
276 /* upload vertex data */
277 _mesa_BufferData(GL_ARRAY_BUFFER_ARB
, sizeof(verts
),
278 verts
, GL_DYNAMIC_DRAW_ARB
);
280 /* texture is already locked, unlock now */
281 _mesa_unlock_texture(ctx
, texObj
);
283 for (dstLevel
= baseLevel
+ 1; dstLevel
<= maxLevel
; dstLevel
++) {
284 const struct gl_texture_image
*srcImage
;
285 const GLuint srcLevel
= dstLevel
- 1;
286 GLsizei srcWidth
, srcHeight
, srcDepth
;
287 GLsizei dstWidth
, dstHeight
, dstDepth
;
289 srcImage
= _mesa_select_tex_image(ctx
, texObj
, faceTarget
, srcLevel
);
290 assert(srcImage
->Border
== 0);
293 srcWidth
= srcImage
->Width
;
294 srcHeight
= srcImage
->Height
;
295 srcDepth
= srcImage
->Depth
;
298 dstWidth
= minify(srcWidth
, 1);
299 dstHeight
= minify(srcHeight
, 1);
300 dstDepth
= minify(srcDepth
, 1);
302 if (dstWidth
== srcImage
->Width
&&
303 dstHeight
== srcImage
->Height
&&
304 dstDepth
== srcImage
->Depth
) {
309 /* Allocate storage for the destination mipmap image(s) */
311 /* Set MaxLevel large enough to hold the new level when we allocate it */
312 _mesa_TexParameteri(target
, GL_TEXTURE_MAX_LEVEL
, dstLevel
);
314 if (!_mesa_prepare_mipmap_level(ctx
, texObj
, dstLevel
,
315 dstWidth
, dstHeight
, dstDepth
,
317 srcImage
->InternalFormat
,
318 srcImage
->TexFormat
)) {
319 /* All done. We either ran out of memory or we would go beyond the
320 * last valid level of an immutable texture if we continued.
325 /* limit minification to src level */
326 _mesa_TexParameteri(target
, GL_TEXTURE_MAX_LEVEL
, srcLevel
);
328 bind_fbo_image(texObj
, faceTarget
, dstLevel
, 0);
330 _mesa_DrawBuffer(GL_COLOR_ATTACHMENT0_EXT
);
333 if (_mesa_CheckFramebufferStatus(GL_FRAMEBUFFER
) !=
334 GL_FRAMEBUFFER_COMPLETE
) {
335 _mesa_problem(ctx
, "Unexpected incomplete framebuffer in "
336 "_mesa_meta_GenerateMipmap()");
340 assert(dstWidth
== ctx
->DrawBuffer
->Width
);
341 assert(dstHeight
== ctx
->DrawBuffer
->Height
);
344 _mesa_set_viewport(ctx
, 0, 0, 0, dstWidth
, dstHeight
);
346 _mesa_DrawArrays(GL_TRIANGLE_FAN
, 0, 4);
349 _mesa_lock_texture(ctx
, texObj
); /* relock */
351 _mesa_BindSampler(ctx
->Texture
.CurrentUnit
, samplerSave
);
355 _mesa_TexParameteri(target
, GL_TEXTURE_MAX_LEVEL
, maxLevelSave
);
357 _mesa_TexParameteri(target
, GL_GENERATE_MIPMAP
, genMipmapSave
);
359 _mesa_BindFramebuffer(GL_FRAMEBUFFER_EXT
, fboSave
);