mesa/samplerobj: Support EXT_texture_sRGB_decode

sRGBDecode state is part of sampler object state but mesa was missing
handlers to access the state. This patch adds the support for required
state changes and queries.

GL_EXT_texture_sRGB_decode issue 4:
"4) Should we add forward-looking support for ARB_sampler_objects?

        RESOLVED: YES

        If ARB_sampler_objects exists in the implementation, the sampler
        objects should also include this parameter per sampler."

Fixes piglit GL_ARB_sampler_objects/GL_EXT_texture_sRGB_decode.

Signed-off-by: Pauli Nieminen <pauli.nieminen@linux.intel.com>
Reviewed-by: Brian Paul <brianp@vmware.com>
Reviewed-by: Eric Anholt <eric@anholt.net>

1 files changed, 55 insertions, 0 deletions

diff --git a/src/mesa/main/samplerobj.c b/src/mesa/main/samplerobj.c
index 8c54c9a..5bb90cf7 100644
--- a/src/mesa/main/samplerobj.c
+++ b/src/mesa/main/samplerobj.c
@@ -582,6 +582,23 @@ set_sampler_cube_map_seamless(struct gl_context *ctx,
    return GL_TRUE;
 }
 
+static GLuint
+set_sampler_srgb_decode(struct gl_context *ctx,
+                              struct gl_sampler_object *samp, GLenum param)
+{
+   if (!ctx->Extensions.EXT_texture_sRGB_decode)
+      return INVALID_PNAME;
+
+   if (samp->sRGBDecode == param)
+      return GL_FALSE;
+
+   if (param != GL_DECODE_EXT && param != GL_SKIP_DECODE_EXT)
+      return INVALID_VALUE;
+
+   flush(ctx);
+   samp->sRGBDecode = param;
+   return GL_TRUE;
+}
 
 static void GLAPIENTRY
 _mesa_SamplerParameteri(GLuint sampler, GLenum pname, GLint param)
@@ -634,6 +651,9 @@ _mesa_SamplerParameteri(GLuint sampler, GLenum pname, GLint param)
    case GL_TEXTURE_CUBE_MAP_SEAMLESS:
       res = set_sampler_cube_map_seamless(ctx, sampObj, param);
       break;
+   case GL_TEXTURE_SRGB_DECODE_EXT:
+      res = set_sampler_srgb_decode(ctx, sampObj, param);
+      break;
    case GL_TEXTURE_BORDER_COLOR:
       /* fall-through */
    default:
@@ -718,6 +738,9 @@ _mesa_SamplerParameterf(GLuint sampler, GLenum pname, GLfloat param)
    case GL_TEXTURE_CUBE_MAP_SEAMLESS:
       res = set_sampler_cube_map_seamless(ctx, sampObj, (GLboolean) param);
       break;
+   case GL_TEXTURE_SRGB_DECODE_EXT:
+      res = set_sampler_srgb_decode(ctx, sampObj, (GLenum) param);
+      break;
    case GL_TEXTURE_BORDER_COLOR:
       /* fall-through */
    default:
@@ -799,6 +822,9 @@ _mesa_SamplerParameteriv(GLuint sampler, GLenum pname, const GLint *params)
    case GL_TEXTURE_CUBE_MAP_SEAMLESS:
       res = set_sampler_cube_map_seamless(ctx, sampObj, params[0]);
       break;
+   case GL_TEXTURE_SRGB_DECODE_EXT:
+      res = set_sampler_srgb_decode(ctx, sampObj, params[0]);
+      break;
    case GL_TEXTURE_BORDER_COLOR:
       {
          GLfloat c[4];
@@ -890,6 +916,9 @@ _mesa_SamplerParameterfv(GLuint sampler, GLenum pname, const GLfloat *params)
    case GL_TEXTURE_CUBE_MAP_SEAMLESS:
       res = set_sampler_cube_map_seamless(ctx, sampObj, (GLboolean) params[0]);
       break;
+   case GL_TEXTURE_SRGB_DECODE_EXT:
+      res = set_sampler_srgb_decode(ctx, sampObj, (GLenum) params[0]);
+      break;
    case GL_TEXTURE_BORDER_COLOR:
       res = set_sampler_border_colorf(ctx, sampObj, params);
       break;
@@ -972,6 +1001,9 @@ _mesa_SamplerParameterIiv(GLuint sampler, GLenum pname, const GLint *params)
    case GL_TEXTURE_CUBE_MAP_SEAMLESS:
       res = set_sampler_cube_map_seamless(ctx, sampObj, params[0]);
       break;
+   case GL_TEXTURE_SRGB_DECODE_EXT:
+      res = set_sampler_srgb_decode(ctx, sampObj, (GLenum) params[0]);
+      break;
    case GL_TEXTURE_BORDER_COLOR:
       res = set_sampler_border_colori(ctx, sampObj, params);
       break;
@@ -1055,6 +1087,9 @@ _mesa_SamplerParameterIuiv(GLuint sampler, GLenum pname, const GLuint *params)
    case GL_TEXTURE_CUBE_MAP_SEAMLESS:
       res = set_sampler_cube_map_seamless(ctx, sampObj, params[0]);
       break;
+   case GL_TEXTURE_SRGB_DECODE_EXT:
+      res = set_sampler_srgb_decode(ctx, sampObj, (GLenum) params[0]);
+      break;
    case GL_TEXTURE_BORDER_COLOR:
       res = set_sampler_border_colorui(ctx, sampObj, params);
       break;
@@ -1149,6 +1184,11 @@ _mesa_GetSamplerParameteriv(GLuint sampler, GLenum pname, GLint *params)
          goto invalid_pname;
       *params = sampObj->CubeMapSeamless;
       break;
+   case GL_TEXTURE_SRGB_DECODE_EXT:
+      if (!ctx->Extensions.EXT_texture_sRGB_decode)
+         goto invalid_pname;
+      *params = (GLenum) sampObj->sRGBDecode;
+      break;
    default:
       goto invalid_pname;
    }
@@ -1222,6 +1262,11 @@ _mesa_GetSamplerParameterfv(GLuint sampler, GLenum pname, GLfloat *params)
          goto invalid_pname;
       *params = (GLfloat) sampObj->CubeMapSeamless;
       break;
+   case GL_TEXTURE_SRGB_DECODE_EXT:
+      if (!ctx->Extensions.EXT_texture_sRGB_decode)
+         goto invalid_pname;
+      *params = (GLfloat) sampObj->sRGBDecode;
+      break;
    default:
       goto invalid_pname;
    }
@@ -1296,6 +1341,11 @@ _mesa_GetSamplerParameterIiv(GLuint sampler, GLenum pname, GLint *params)
          goto invalid_pname;
       *params = sampObj->CubeMapSeamless;
       break;
+   case GL_TEXTURE_SRGB_DECODE_EXT:
+      if (!ctx->Extensions.EXT_texture_sRGB_decode)
+         goto invalid_pname;
+      *params = (GLenum) sampObj->sRGBDecode;
+      break;
    default:
       goto invalid_pname;
    }
@@ -1370,6 +1420,11 @@ _mesa_GetSamplerParameterIuiv(GLuint sampler, GLenum pname, GLuint *params)
          goto invalid_pname;
       *params = sampObj->CubeMapSeamless;
       break;
+   case GL_TEXTURE_SRGB_DECODE_EXT:
+      if (!ctx->Extensions.EXT_texture_sRGB_decode)
+         goto invalid_pname;
+      *params = (GLenum) sampObj->sRGBDecode;
+      break;
    default:
       goto invalid_pname;
    }