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Flattened out nested if-statements in new engine's fragment shader to improve compatibility with older GPUs (e.g., NVS 300)

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This commit is contained in:
Bart Trzynadlowski 2016-04-22 23:46:49 +00:00
parent 58d187e59a
commit 908d979cd7
1 changed files with 11 additions and 13 deletions
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24
Src/Graphics/New3D/R3DShader.cpp
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@ -3,7 +3,7 @@
namespace New3D {
static char *vertexShaderBasic =
static const char *vertexShaderBasic =
// uniforms
"uniform float fogIntensity;\n"
@ -31,7 +31,7 @@ static char *vertexShaderBasic =
"gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;\n"
"}\n";
static char *fragmentShaderBasic =
static const char *fragmentShaderBasic =
"uniform sampler2D tex;\n"
"uniform int textureEnabled;\n"
@ -59,18 +59,16 @@ static char *fragmentShaderBasic =
"texData = vec4(1.0, 1.0, 1.0, 1.0);\n"
"if(textureEnabled==1) {\n"
// Done this way because some older GPUs have difficulty with nested if-
// statements (e.g., NVS 300)
"if (textureEnabled == 1) {\n"
"texData = texture2D( tex, gl_TexCoord[0].st);\n"
"if (alphaTest==1) {\n" // does it make any sense to do this later?
"if (texData.a < (8.0/16.0)) {\n"
"discard;\n"
"}\n"
"}\n"
"if (textureAlpha == 0) {\n"
"texData.a = 1.0;\n"
"}\n"
"}\n"
"if (textureEnabled == 1 && alphaTest == 1 && texData.a < (8.0/16.0)) {\n"
"discard;\n"
"}\n"
"if (textureEnabled == 1 && textureAlpha == 0) {\n"
"texData.a = 1.0;\n"
"}\n"
"colData = gl_Color;\n"