From c5bd6fdbc53c796a494876c72be5615408096576 Mon Sep 17 00:00:00 2001
From: Filippo Argiolas <filippo.argiolas@gmail.com>
Date: Thu, 14 Aug 2008 09:39:55 +0200
Subject: [PATCH] [164/906] rename blend_fragment_source to sum_fragment_source
 and add uniform blending parameters

---
 gst/gl/effects/gstgleffectglow.c     | 6 ++++--
 gst/gl/effects/gstgleffectssources.c | 6 ++++--
 gst/gl/effects/gstgleffectssources.h | 2 +-
 3 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/gst/gl/effects/gstgleffectglow.c b/gst/gl/effects/gstgleffectglow.c
index 4fe53d8152..460e64e536 100644
--- a/gst/gl/effects/gstgleffectglow.c
+++ b/gst/gl/effects/gstgleffectglow.c
@@ -145,7 +145,7 @@ gst_gl_effects_glow_step_four (gint width, gint height, guint texture, gpointer
   }
   
   g_return_if_fail (
-    gst_gl_shader_compile_and_check (shader, blend_fragment_source,
+    gst_gl_shader_compile_and_check (shader, sum_fragment_source,
 				     GST_GL_SHADER_FRAGMENT_SOURCE));
 
   glMatrixMode (GL_PROJECTION);
@@ -158,13 +158,15 @@ gst_gl_effects_glow_step_four (gint width, gint height, guint texture, gpointer
   glBindTexture (GL_TEXTURE_RECTANGLE_ARB, effects->intexture);
   glDisable(GL_TEXTURE_RECTANGLE_ARB);
   
+  gst_gl_shader_set_uniform_1f (shader, "alpha", 1.0);
   gst_gl_shader_set_uniform_1i (shader, "base", 2);
-  
+    
   glActiveTexture (GL_TEXTURE1);
   glEnable (GL_TEXTURE_RECTANGLE_ARB);
   glBindTexture (GL_TEXTURE_RECTANGLE_ARB, texture);
   glDisable(GL_TEXTURE_RECTANGLE_ARB);
   
+  gst_gl_shader_set_uniform_1f (shader, "beta", 1/3.5);
   gst_gl_shader_set_uniform_1i (shader, "blend", 1);
 
   gst_gl_effects_draw_texture (effects, texture);
diff --git a/gst/gl/effects/gstgleffectssources.c b/gst/gl/effects/gstgleffectssources.c
index d151eb5e1e..77485a46fb 100644
--- a/gst/gl/effects/gstgleffectssources.c
+++ b/gst/gl/effects/gstgleffectssources.c
@@ -132,12 +132,14 @@ const gchar *vconv9_fragment_source =
 "}";
 
 /* TODO: support several blend modes */
-const gchar *blend_fragment_source = 
+const gchar *sum_fragment_source = 
 "#extension GL_ARB_texture_rectangle : enable\n"
 "uniform sampler2DRect base;"
 "uniform sampler2DRect blend;"
+"uniform float alpha;"
+"uniform float beta;"
 "void main () {"
 "  vec4 basecolor = texture2DRect (base, gl_TexCoord[0].st);"
 "  vec4 blendcolor = texture2DRect (blend, gl_TexCoord[0].st);"
-"  gl_FragColor = basecolor + blendcolor / 3.5;"
+"  gl_FragColor = alpha * basecolor + beta * blendcolor;"
 "}";
diff --git a/gst/gl/effects/gstgleffectssources.h b/gst/gl/effects/gstgleffectssources.h
index c20d998a80..aba2c0c7df 100644
--- a/gst/gl/effects/gstgleffectssources.h
+++ b/gst/gl/effects/gstgleffectssources.h
@@ -29,6 +29,6 @@ const gchar *stretch_fragment_source;
 const gchar *luma_threshold_fragment_source;
 const gchar *hconv9_fragment_source;
 const gchar *vconv9_fragment_source;
-const gchar *blend_fragment_source;
+const gchar *sum_fragment_source;
 
 #endif /* __GST_GL_EFFECTS_SOURCES_H__ */