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OpenGL2: Speed up tonemap shader.

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This commit is contained in:
SmileTheory 2014-10-27 06:37:57 -07:00
parent 3765652778
commit 7e808f92d6
2 changed files with 34 additions and 23 deletions
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14
code/renderergl2/glsl/tonemap_vp.glsl
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@ -2,12 +2,26 @@ attribute vec3 attr_Position;
attribute vec4 attr_TexCoord0;
uniform mat4 u_ModelViewProjectionMatrix;
uniform vec3 u_ToneMinAvgMaxLinear;
varying vec2 var_TexCoords;
varying float var_InvWhite;
float FilmicTonemap(float x)
{
const float SS = 0.22; // Shoulder Strength
const float LS = 0.30; // Linear Strength
const float LA = 0.10; // Linear Angle
const float TS = 0.20; // Toe Strength
const float TAN = 0.01; // Toe Angle Numerator
const float TAD = 0.30; // Toe Angle Denominator
return ((x*(SS*x+LA*LS)+TS*TAN)/(x*(SS*x+LS)+TS*TAD)) - TAN/TAD;
}
void main()
{
gl_Position = u_ModelViewProjectionMatrix * vec4(attr_Position, 1.0);
var_TexCoords = attr_TexCoord0.st;
var_InvWhite = 1.0 / FilmicTonemap(u_ToneMinAvgMaxLinear.z - u_ToneMinAvgMaxLinear.x);
}