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meta: save and restore swizzle for _GenerateMipmap 

This makes sure to use a no-op swizzle while iteratively rendering each
level of a mipmap otherwise we may loose components and effectively
apply the swizzle twice by the time these levels are sampled.

Signed-off-by: Robert Bragg <robert@sixbynine.org>
Reviewed-by: Chris Forbes <chrisf@ijw.co.nz>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
This commit is contained in:
Robert Bragg 2014-06-08 19:02:41 +01:00
parent 63117ac329
commit c6f118484c
1 changed files with 12 additions and 0 deletions
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12
src/mesa/drivers/common/meta_generate_mipmap.c
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@ -43,6 +43,7 @@
#include "main/varray.h"
#include "main/viewport.h"
#include "drivers/common/meta.h"
#include "program/prog_instruction.h"
/**
@ -168,6 +169,8 @@ _mesa_meta_GenerateMipmap(struct gl_context *ctx, GLenum target,
GLenum faceTarget;
GLuint dstLevel;
GLuint samplerSave;
GLint swizzle[4];
GLboolean swizzleSaved = GL_FALSE;
if (fallback_required(ctx, target, texObj)) {
_mesa_generate_mipmap(ctx, target, texObj);
@ -231,6 +234,13 @@ _mesa_meta_GenerateMipmap(struct gl_context *ctx, GLenum target,
_mesa_TexParameteri(target, GL_GENERATE_MIPMAP, GL_FALSE);
if (texObj->_Swizzle != SWIZZLE_NOOP) {
static const GLint swizzleNoop[4] = { GL_RED, GL_GREEN, GL_BLUE, GL_ALPHA };
memcpy(swizzle, texObj->Swizzle, sizeof(swizzle));
swizzleSaved = GL_TRUE;
_mesa_TexParameteriv(target, GL_TEXTURE_SWIZZLE_RGBA, swizzleNoop);
}
/* Silence valgrind warnings about reading uninitialized stack. */
memset(verts, 0, sizeof(verts));
@ -347,4 +357,6 @@ _mesa_meta_GenerateMipmap(struct gl_context *ctx, GLenum target,
_mesa_TexParameteri(target, GL_TEXTURE_MAX_LEVEL, maxLevelSave);
if (genMipmapSave)
_mesa_TexParameteri(target, GL_GENERATE_MIPMAP, genMipmapSave);
if (swizzleSaved)
_mesa_TexParameteriv(target, GL_TEXTURE_SWIZZLE_RGBA, swizzle);
}