From b2491972591788fea0e55805cea3e9be8760969b Mon Sep 17 00:00:00 2001
From: Eric Anholt <eric@anholt.net>
Date: Fri, 15 Apr 2011 15:48:32 -0700
Subject: [PATCH] meta: Add support for ARB_color_buffer_float to
 _mesa_meta_DrawPixels.

Tested with piglit arb_color_buffer_float-drawpixels.

Reviewed-by: Brian Paul <brianp@vmware.com>
---
 src/mesa/drivers/common/meta.c | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/src/mesa/drivers/common/meta.c b/src/mesa/drivers/common/meta.c
index c92bf29c30f..27681a29139 100644
--- a/src/mesa/drivers/common/meta.c
+++ b/src/mesa/drivers/common/meta.c
@@ -92,6 +92,7 @@
 #define META_TEXTURE        0x1000
 #define META_VERTEX         0x2000
 #define META_VIEWPORT       0x4000
+#define META_CLAMP_FRAGMENT_COLOR 0x8000
 /*@}*/
 
 
@@ -180,6 +181,9 @@ struct save_state
    GLint ViewportX, ViewportY, ViewportW, ViewportH;
    GLclampd DepthNear, DepthFar;
 
+   /** META_CLAMP_FRAGMENT_COLOR */
+   GLenum ClampFragmentColor;
+
    /** Miscellaneous (always disabled) */
    GLboolean Lighting;
 };
@@ -569,6 +573,17 @@ _mesa_meta_begin(struct gl_context *ctx, GLbitfield state)
       _mesa_DepthRange(0.0, 1.0);
    }
 
+   if (state & META_CLAMP_FRAGMENT_COLOR) {
+      save->ClampFragmentColor = ctx->Color.ClampFragmentColor;
+
+      /* Generally in here we want to do clamping according to whether
+       * it's for the pixel path (ClampFragmentColor is GL_TRUE),
+       * regardless of the internal implementation of the metaops.
+       */
+      if (ctx->Color.ClampFragmentColor != GL_TRUE)
+	 _mesa_ClampColorARB(GL_CLAMP_FRAGMENT_COLOR, GL_FALSE);
+   }
+
    /* misc */
    {
       save->Lighting = ctx->Light.Enabled;
@@ -833,6 +848,10 @@ _mesa_meta_end(struct gl_context *ctx)
       _mesa_DepthRange(save->DepthNear, save->DepthFar);
    }
 
+   if (state & META_CLAMP_FRAGMENT_COLOR) {
+      _mesa_ClampColorARB(GL_CLAMP_FRAGMENT_COLOR, save->ClampFragmentColor);
+   }
+
    /* misc */
    if (save->Lighting) {
       _mesa_set_enable(ctx, GL_LIGHTING, GL_TRUE);
@@ -1803,6 +1822,14 @@ _mesa_meta_DrawPixels(struct gl_context *ctx,
          texIntFormat = format;
       else
          texIntFormat = GL_RGBA;
+
+      /* If we're not supposed to clamp the resulting color, then just
+       * promote our texture to fully float.  We could do better by
+       * just going for the matching set of channels, in floating
+       * point.
+       */
+      if (ctx->Color.ClampFragmentColor != GL_TRUE)
+	 texIntFormat = GL_RGBA32F;
    }
    else if (_mesa_is_stencil_format(format)) {
       if (ctx->Extensions.ARB_fragment_program &&
@@ -1861,6 +1888,7 @@ _mesa_meta_DrawPixels(struct gl_context *ctx,
                           META_TRANSFORM |
                           META_VERTEX |
                           META_VIEWPORT |
+			  META_CLAMP_FRAGMENT_COLOR |
                           metaExtraSave));
 
    newTex = alloc_texture(tex, width, height, texIntFormat);
-- 
2.30.2