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[442/906] blur: optimize coordinates calculations

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Save 28 instructions on i915 (mainly redundant MOVs) and gain a 25%
(roughly measured with videotestsrc and glimagesink sync=false) speed
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This commit is contained in:
Filippo Argiolas 2010-04-27 21:56:04 +02:00 committed by Matthew Waters
parent 5fd66383ab
commit b3c4eb4c61
1 changed files with 19 additions and 23 deletions
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42
gst/gl/effects/gstgleffectssources.c
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@ -390,17 +390,15 @@ const gchar *hconv9_fragment_source =
"uniform float kernel[9];"
"void main () {"
" vec2 texturecoord[9];"
" float s = gl_TexCoord[0].s;"
" float t = gl_TexCoord[0].t;"
" texturecoord[0] = vec2(s-4.0, t);"
" texturecoord[1] = vec2(s-3.0, t);"
" texturecoord[2] = vec2(s-2.0, t);"
" texturecoord[3] = vec2(s-1.0, t);"
" texturecoord[4] = vec2(s, t);"
" texturecoord[5] = vec2(s+1.0, t);"
" texturecoord[6] = vec2(s+2.0, t);"
" texturecoord[7] = vec2(s+3.0, t);"
" texturecoord[8] = vec2(s+4.0, t);"
" texturecoord[4] = gl_TexCoord[0].st;"
" texturecoord[3] = texturecoord[4] - vec2(1.0, 0.0);"
" texturecoord[2] = texturecoord[3] - vec2(1.0, 0.0);"
" texturecoord[1] = texturecoord[2] - vec2(1.0, 0.0);"
" texturecoord[0] = texturecoord[1] - vec2(1.0, 0.0);"
" texturecoord[5] = texturecoord[4] + vec2(1.0, 0.0);"
" texturecoord[6] = texturecoord[5] + vec2(1.0, 0.0);"
" texturecoord[7] = texturecoord[6] + vec2(1.0, 0.0);"
" texturecoord[8] = texturecoord[7] + vec2(1.0, 0.0);"
" int i;"
" vec4 sum = vec4 (0.0);"
" for (i = 0; i < 9; i++) { "
@ -417,22 +415,20 @@ const gchar *vconv9_fragment_source =
"uniform float kernel[9];"
"void main () {"
" vec2 texturecoord[9];"
" float s = gl_TexCoord[0].s;"
" float t = gl_TexCoord[0].t;"
" texturecoord[0] = vec2(s, t-4.0);"
" texturecoord[1] = vec2(s, t-3.0);"
" texturecoord[2] = vec2(s, t-2.0);"
" texturecoord[3] = vec2(s, t-1.0);"
" texturecoord[4] = vec2(s, t);"
" texturecoord[5] = vec2(s, t+1.0);"
" texturecoord[6] = vec2(s, t+2.0);"
" texturecoord[7] = vec2(s, t+3.0);"
" texturecoord[8] = vec2(s, t+4.0);"
" texturecoord[4] = gl_TexCoord[0].st;"
" texturecoord[3] = texturecoord[4] - vec2(0.0, 1.0);"
" texturecoord[2] = texturecoord[3] - vec2(0.0, 1.0);"
" texturecoord[1] = texturecoord[2] - vec2(0.0, 1.0);"
" texturecoord[0] = texturecoord[1] - vec2(0.0, 1.0);"
" texturecoord[5] = texturecoord[4] + vec2(0.0, 1.0);"
" texturecoord[6] = texturecoord[5] + vec2(0.0, 1.0);"
" texturecoord[7] = texturecoord[6] + vec2(0.0, 1.0);"
" texturecoord[8] = texturecoord[7] + vec2(0.0, 1.0);"
" int i;"
" vec4 sum = vec4 (0.0);"
" for (i = 0; i < 9; i++) { "
" vec4 neighbor = texture2DRect(tex, texturecoord[i]);"
" sum += neighbor * kernel[i]; "
" sum += neighbor * kernel[i];"
" }"
" gl_FragColor = sum;"
"}";