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[444/906] laplacian: precalculate coordinates

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Precalculate coordinates to avoid unneeded texture indirections.
Now laplacian works on i915.
This commit is contained in:
Filippo Argiolas 2010-04-29 09:02:12 +02:00 committed by Matthew Waters
parent 270ce448e4
commit ac190bc460
1 changed files with 29 additions and 24 deletions
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53
gst/gl/gstglfilterlaplacian.c
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@ -1,6 +1,6 @@
/*
* GStreamer
* Copyright (C) 2008 Filippo Argiolas <filippo.argiolas@gmail.com>
* Copyright (C) 2008-2010 Filippo Argiolas <filippo.argiolas@gmail.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
@ -65,30 +65,35 @@ static void gst_gl_filter_laplacian_callback (gint width, gint height,
guint texture, gpointer stuff);
/* *INDENT-OFF* */
/* This filter is meant as a demo of gst-plugins-gl + glsl
capabilities. So I'm keeping this shader readable enough. If and
when this shader will be used in production be careful to hard code
kernel into the shader and remove unneeded zero multiplications in
the convolution */
static const gchar *convolution_fragment_source =
"#extension GL_ARB_texture_rectangle : enable\n"
"uniform sampler2DRect tex;"
"uniform float kernel[9];"
"void main () {"
" vec2 offset[9];"
" offset[0] = vec2(-1.0,-1.0);"
" offset[1] = vec2( 0.0,-1.0);"
" offset[2] = vec2( 1.0,-1.0);"
" offset[3] = vec2(-1.0, 0.0);"
" offset[4] = vec2( 0.0, 0.0);"
" offset[5] = vec2( 1.0, 0.0);"
" offset[6] = vec2(-1.0, 1.0);"
" offset[7] = vec2( 0.0, 1.0);"
" offset[8] = vec2( 1.0, 1.0);"
" vec2 texturecoord = gl_TexCoord[0].st;"
" int i;"
" vec4 sum = vec4 (0.0);"
" for (i = 0; i < 9; i++) { "
" vec4 neighbor = texture2DRect(tex, texturecoord + vec2(offset[i]));"
" sum += neighbor * kernel[i];"
" }"
" gl_FragColor = sum;"
"}";
"#extension GL_ARB_texture_rectangle : enable\n"
"uniform sampler2DRect tex;"
"uniform float kernel[9];"
"void main () {"
" vec2 texturecoord[9];"
" texturecoord[4] = gl_TexCoord[0].st;" /* 0 0 */
" texturecoord[5] = texturecoord[4] + vec2(1.0, 0.0);" /* 1 0 */
" texturecoord[2] = texturecoord[5] - vec2(0.0, 1.0);" /* 1 -1 */
" texturecoord[1] = texturecoord[2] - vec2(1.0, 0.0);" /* 0 -1 */
" texturecoord[0] = texturecoord[1] - vec2(1.0, 0.0);" /* -1 -1 */
" texturecoord[3] = texturecoord[0] + vec2(0.0, 1.0);" /* -1 0 */
" texturecoord[6] = texturecoord[3] + vec2(0.0, 1.0);" /* -1 1 */
" texturecoord[7] = texturecoord[6] + vec2(1.0, 0.0);" /* 0 1 */
" texturecoord[8] = texturecoord[7] + vec2(1.0, 0.0);" /* 1 1 */
" int i;"
" vec4 sum = vec4 (0.0);"
" for (i = 0; i < 9; i++) { "
" vec4 neighbor = texture2DRect(tex, texturecoord[i]);"
" sum += neighbor * kernel[i];"
" }"
" gl_FragColor = sum;"
"}";
/* *INDENT-ON* */
static void