Mesa (master): meta: Use sampler object for mipmap generation

[Kenneth Graunke]

Module: Mesa
Branch: master
Commit: b9daa834633f0e012a35f67cf232464e5cb3b9b6
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=b9daa834633f0e012a35f67cf232464e5cb3b9b6

Author: Pauli Nieminen <pauli.nieminen at linux.intel.com>
Date:   Tue Jun 12 21:38:58 2012 +0300

meta: Use sampler object for mipmap generation

Sampler objects are perfect for meta operations.Sampler object
is separate state object that shadows the sampling state in texture
object. With sampler object mipmap can maintain same sampling state for
all subsequent generation requests.

Signed-off-by: Pauli Nieminen <pauli.nieminen at linux.intel.com>
Reviewed-by: Brian Paul <brianp at vmware.com>
Reviewed-by: Kenneth Graunke <kenneth at whitecape.org>

---

 src/mesa/drivers/common/meta.c |   52 ++++++++++++++++++++-------------------
 1 files changed, 27 insertions(+), 25 deletions(-)

diff --git a/src/mesa/drivers/common/meta.c b/src/mesa/drivers/common/meta.c
index af89d81..850a2b4 100644
--- a/src/mesa/drivers/common/meta.c
+++ b/src/mesa/drivers/common/meta.c
@@ -70,6 +70,7 @@
 #include "main/uniforms.h"
 #include "main/varray.h"
 #include "main/viewport.h"
+#include "main/samplerobj.h"
 #include "program/program.h"
 #include "swrast/swrast.h"
 #include "drivers/common/meta.h"
@@ -278,6 +279,7 @@ struct gen_mipmap_state
    GLuint ArrayObj;
    GLuint VBO;
    GLuint FBO;
+   GLuint Sampler;
 };
 
 
@@ -2925,14 +2927,8 @@ _mesa_meta_GenerateMipmap(struct gl_context *ctx, GLenum target,
    struct vertex verts[4];
    const GLuint baseLevel = texObj->BaseLevel;
    const GLuint maxLevel = texObj->MaxLevel;
-   const GLenum minFilterSave = texObj->Sampler.MinFilter;
-   const GLenum magFilterSave = texObj->Sampler.MagFilter;
    const GLint maxLevelSave = texObj->MaxLevel;
    const GLboolean genMipmapSave = texObj->GenerateMipmap;
-   const GLenum wrapSSave = texObj->Sampler.WrapS;
-   const GLenum wrapTSave = texObj->Sampler.WrapT;
-   const GLenum wrapRSave = texObj->Sampler.WrapR;
-   const GLenum srgbDecodeSave = texObj->Sampler.sRGBDecode;
    const GLenum srgbBufferSave = ctx->Color.sRGBEnabled;
    const GLuint fboSave = ctx->DrawBuffer->Name;
    const GLuint original_active_unit = ctx->Texture.CurrentUnit;
@@ -2940,6 +2936,7 @@ _mesa_meta_GenerateMipmap(struct gl_context *ctx, GLenum target,
    GLuint dstLevel;
    const GLuint border = 0;
    const GLint slice = 0;
+   GLuint samplerSave;
 
    if (_mesa_meta_check_generate_mipmap_fallback(ctx, target, texObj)) {
       _mesa_generate_mipmap(ctx, target, texObj);
@@ -2957,6 +2954,9 @@ _mesa_meta_GenerateMipmap(struct gl_context *ctx, GLenum target,
 
    _mesa_meta_begin(ctx, MESA_META_ALL);
 
+   samplerSave = ctx->Texture.Unit[ctx->Texture.CurrentUnit].Sampler ?
+      ctx->Texture.Unit[ctx->Texture.CurrentUnit].Sampler->Name : 0;
+
    if (original_active_unit != 0)
       _mesa_BindTexture(target, texObj->Name);
 
@@ -2987,20 +2987,29 @@ _mesa_meta_GenerateMipmap(struct gl_context *ctx, GLenum target,
    if (!mipmap->FBO) {
       _mesa_GenFramebuffersEXT(1, &mipmap->FBO);
    }
+
+   if (!mipmap->Sampler) {
+      _mesa_GenSamplers(1, &mipmap->Sampler);
+      _mesa_BindSampler(ctx->Texture.CurrentUnit, mipmap->Sampler);
+      _mesa_SamplerParameteri(mipmap->Sampler, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
+      _mesa_SamplerParameteri(mipmap->Sampler, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+      _mesa_SamplerParameteri(mipmap->Sampler, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+      _mesa_SamplerParameteri(mipmap->Sampler, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+      _mesa_SamplerParameteri(mipmap->Sampler, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
+      /* We don't want to encode or decode sRGB values; treat them as linear */
+      if (ctx->Extensions.EXT_texture_sRGB_decode) {
+         _mesa_SamplerParameteri(mipmap->Sampler, GL_TEXTURE_SRGB_DECODE_EXT,
+               GL_SKIP_DECODE_EXT);
+      }
+
+   } else {
+      _mesa_BindSampler(ctx->Texture.CurrentUnit, mipmap->Sampler);
+   }
+
    _mesa_BindFramebufferEXT(GL_FRAMEBUFFER_EXT, mipmap->FBO);
 
-   _mesa_TexParameteri(target, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
-   _mesa_TexParameteri(target, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    _mesa_TexParameteri(target, GL_GENERATE_MIPMAP, GL_FALSE);
-   _mesa_TexParameteri(target, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
-   _mesa_TexParameteri(target, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
-   _mesa_TexParameteri(target, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
 
-   /* We don't want to encode or decode sRGB values; treat them as linear */
-   if (ctx->Extensions.EXT_texture_sRGB_decode) {
-      _mesa_TexParameteri(target, GL_TEXTURE_SRGB_DECODE_EXT,
-                          GL_SKIP_DECODE_EXT);
-   }
    if (ctx->Extensions.EXT_framebuffer_sRGB) {
       _mesa_set_enable(ctx, GL_FRAMEBUFFER_SRGB_EXT, GL_FALSE);
    }
@@ -3127,25 +3136,18 @@ _mesa_meta_GenerateMipmap(struct gl_context *ctx, GLenum target,
       _mesa_DrawArrays(GL_TRIANGLE_FAN, 0, 4);
    }
 
-   if (ctx->Extensions.EXT_texture_sRGB_decode) {
-      _mesa_TexParameteri(target, GL_TEXTURE_SRGB_DECODE_EXT,
-                          srgbDecodeSave);
-   }
    if (ctx->Extensions.EXT_framebuffer_sRGB && srgbBufferSave) {
       _mesa_set_enable(ctx, GL_FRAMEBUFFER_SRGB_EXT, GL_TRUE);
    }
 
    _mesa_lock_texture(ctx, texObj); /* relock */
 
+   _mesa_BindSampler(ctx->Texture.CurrentUnit, samplerSave);
+
    _mesa_meta_end(ctx);
 
-   _mesa_TexParameteri(target, GL_TEXTURE_MIN_FILTER, minFilterSave);
-   _mesa_TexParameteri(target, GL_TEXTURE_MAG_FILTER, magFilterSave);
    _mesa_TexParameteri(target, GL_TEXTURE_MAX_LEVEL, maxLevelSave);
    _mesa_TexParameteri(target, GL_GENERATE_MIPMAP, genMipmapSave);
-   _mesa_TexParameteri(target, GL_TEXTURE_WRAP_S, wrapSSave);
-   _mesa_TexParameteri(target, GL_TEXTURE_WRAP_T, wrapTSave);
-   _mesa_TexParameteri(target, GL_TEXTURE_WRAP_R, wrapRSave);
 
    _mesa_BindFramebufferEXT(GL_FRAMEBUFFER_EXT, fboSave);
 }