diff options
| -rw-r--r-- | src/mesa/state_tracker/st_gen_mipmap.c | 82 |
1 files changed, 80 insertions, 2 deletions
diff --git a/src/mesa/state_tracker/st_gen_mipmap.c b/src/mesa/state_tracker/st_gen_mipmap.c index 58f6933652..f75b2348b8 100644 --- a/src/mesa/state_tracker/st_gen_mipmap.c +++ b/src/mesa/state_tracker/st_gen_mipmap.c @@ -27,6 +27,7 @@ #include "main/imports.h" +#include "main/macros.h" #include "main/mipmap.h" #include "main/teximage.h" #include "main/texformat.h" @@ -161,6 +162,43 @@ fallback_generate_mipmap(GLcontext *ctx, GLenum target, } +/** + * Compute the expected number of mipmap levels in the texture given + * the width/height/depth of the base image and the GL_TEXTURE_BASE_LEVEL/ + * GL_TEXTURE_MAX_LEVEL settings. This will tell us how many mipmap + * level should be generated. + */ +static GLuint +compute_num_levels(GLcontext *ctx, + struct gl_texture_object *texObj, + GLenum target) +{ + if (target == GL_TEXTURE_RECTANGLE_ARB) { + return 1; + } + else { + const GLuint maxLevels = texObj->MaxLevel - texObj->BaseLevel + 1; + const struct gl_texture_image *baseImage = + _mesa_get_tex_image(ctx, texObj, target, texObj->BaseLevel); + GLuint size, numLevels; + + size = MAX2(baseImage->Width2, baseImage->Height2); + size = MAX2(size, baseImage->Depth2); + + numLevels = 0; + + while (size > 0) { + numLevels++; + size >>= 1; + } + + numLevels = MIN2(numLevels, maxLevels); + + return numLevels; + } +} + + void st_generate_mipmap(GLcontext *ctx, GLenum target, struct gl_texture_object *texObj) @@ -174,9 +212,49 @@ st_generate_mipmap(GLcontext *ctx, GLenum target, if (!pt) return; - lastLevel = pt->last_level; + /* find expected last mipmap level */ + lastLevel = compute_num_levels(ctx, texObj, target) - 1; + + if (pt->last_level < lastLevel) { + /* The current gallium texture doesn't have space for all the + * mipmap levels we need to generate. So allocate a new texture. + */ + struct st_texture_object *stObj = st_texture_object(texObj); + struct pipe_texture *oldTex = stObj->pt; + GLboolean needFlush; + + /* create new texture with space for more levels */ + stObj->pt = st_texture_create(st, + oldTex->target, + oldTex->format, + lastLevel, + oldTex->width[0], + oldTex->height[0], + oldTex->depth[0], + oldTex->tex_usage); + + /* The texture isn't in a "complete" state yet so set the expected + * lastLevel here, since it won't get done in st_finalize_texture(). + */ + stObj->lastLevel = lastLevel; + + /* This will copy the old texture's base image into the new texture + * which we just allocated. + */ + st_finalize_texture(ctx, st->pipe, texObj, &needFlush); + + /* release the old tex (will likely be freed too) */ + pipe_texture_reference(&oldTex, NULL); + + pt = stObj->pt; + } + + assert(lastLevel <= pt->last_level); - if (!st_render_mipmap(st, target, pt, baseLevel, lastLevel)) { + /* Recall that the Mesa BaseLevel image is stored in the gallium + * texture's level[0] position. So pass baseLevel=0 here. + */ + if (!st_render_mipmap(st, target, pt, 0, lastLevel)) { fallback_generate_mipmap(ctx, target, texObj); } |