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Fixed new 3D engine's fragment shader to work on some older GPUs by reducing the number of discard statements to one

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Bart Trzynadlowski 2016-08-24 22:21:18 +00:00
parent 4b184b05dc
commit 458684eb22
1 changed files with 60 additions and 56 deletions
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116
Src/Graphics/New3D/R3DShader.cpp
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@ -54,86 +54,90 @@ static const char *fragmentShaderBasic =
"void main()\n" "void main()\n"
"{\n" "{\n"
"vec4 tex1Data;\n" "vec4 tex1Data;\n"
"vec4 colData;\n" "vec4 colData;\n"
"vec4 finalData;\n" "vec4 finalData;\n"
"tex1Data = vec4(1.0, 1.0, 1.0, 1.0);\n" "bool discardFragment = false;\n"
"if(textureEnabled==1) {\n" "tex1Data = vec4(1.0, 1.0, 1.0, 1.0);\n"
"tex1Data = texture2D( tex1, gl_TexCoord[0].st);\n" "if(textureEnabled==1) {\n"
"if (microTexture==1) {\n" "tex1Data = texture2D( tex1, gl_TexCoord[0].st);\n"
"vec4 tex2Data = texture2D( tex2, gl_TexCoord[0].st * 4.0);\n"
"tex1Data = (tex1Data+tex2Data)/2.0;\n"
"}\n"
"if (alphaTest==1) {\n" // does it make any sense to do this later? "if (microTexture==1) {\n"
"if (tex1Data.a < (8.0/16.0)) {\n" "vec4 tex2Data = texture2D( tex2, gl_TexCoord[0].st * 4.0);\n"
"discard;\n" "tex1Data = (tex1Data+tex2Data)/2.0;\n"
"}\n" "}\n"
"}\n"
"if (textureAlpha == 0) {\n" "if (alphaTest==1) {\n" // does it make any sense to do this later?
"tex1Data.a = 1.0;\n" "if (tex1Data.a < (8.0/16.0)) {\n"
"}\n" "discardFragment = true;\n"
"}\n" "}\n"
"}\n"
"colData = gl_Color;\n" "if (textureAlpha == 0) {\n"
"tex1Data.a = 1.0;\n"
"}\n"
"}\n"
"finalData = tex1Data * colData;\n" "colData = gl_Color;\n"
"if (finalData.a < (1.0/16.0)) {\n" // basically chuck out any totally transparent pixels value = 1/16 the smallest transparency level h/w supports
"discard;\n"
"}\n"
"finalData = tex1Data * colData;\n"
"if (lightEnable==1)\n" "if (finalData.a < (1.0/16.0)) {\n" // basically chuck out any totally transparent pixels value = 1/16 the smallest transparency level h/w supports
"{\n" "discardFragment = true;\n"
"vec3 lightIntensity;\n" "}\n"
"vec3 sunVector;\n" // sun lighting vector (as reflecting away from vertex)
"float sunFactor;\n" // sun light projection along vertex normal (0.0 to 1.0)
// Real3D -> OpenGL view space convention (TO-DO: do this outside of shader) "if (discardFragment) {\n"
"sunVector = lighting[0] * vec3(1.0, -1.0, -1.0);\n" "discard;\n"
"}\n"
"if (lightEnable==1) {\n"
"vec3 lightIntensity;\n"
"vec3 sunVector;\n" // sun lighting vector (as reflecting away from vertex)
"float sunFactor;\n" // sun light projection along vertex normal (0.0 to 1.0)
// Compute diffuse factor for sunlight // Real3D -> OpenGL view space convention (TO-DO: do this outside of shader)
"sunFactor = max(dot(sunVector, fsViewNormal), 0.0);\n" "sunVector = lighting[0] * vec3(1.0, -1.0, -1.0);\n"
// Total light intensity: sum of all components // Compute diffuse factor for sunlight
"lightIntensity = vec3(sunFactor*lighting[1].x + lighting[1].y);\n" // ambient + diffuse "sunFactor = max(dot(sunVector, fsViewNormal), 0.0);\n"
"lightIntensity = clamp(lightIntensity,0.0,1.0);\n" // Total light intensity: sum of all components
"lightIntensity = vec3(sunFactor*lighting[1].x + lighting[1].y);\n" // ambient + diffuse
"vec2 ellipse;\n" "lightIntensity = clamp(lightIntensity,0.0,1.0);\n"
"float insideSpot;\n"
// Compute spotlight and apply lighting "vec2 ellipse;\n"
"ellipse = (gl_FragCoord.xy - spotEllipse.xy) / spotEllipse.zw;\n" "float insideSpot;\n"
"insideSpot = dot(ellipse, ellipse);\n"
"if ((insideSpot <= 1.0) && (-fsViewVertex.z >= spotRange.x)) {\n" // Compute spotlight and apply lighting
"lightIntensity.rgb += (1.0 - insideSpot)*spotColor;\n" "ellipse = (gl_FragCoord.xy - spotEllipse.xy) / spotEllipse.zw;\n"
"}\n" "insideSpot = dot(ellipse, ellipse);\n"
"if ((insideSpot <= 1.0) && (-fsViewVertex.z >= spotRange.x)) {\n"
"finalData.rgb *= lightIntensity;\n" "lightIntensity.rgb += (1.0 - insideSpot)*spotColor;\n"
"}\n"
"if (sunFactor > 0.0 && specularCoefficient > 0.0) {\n"
"finalData.rgb *= lightIntensity;\n"
"vec3 v = normalize(-fsViewVertex);\n" "if (sunFactor > 0.0 && specularCoefficient > 0.0) {\n"
"vec3 h = normalize(sunVector + v);\n" // halfway vector
"float NdotHV = max(dot(fsViewNormal,h),0.0);\n" "vec3 v = normalize(-fsViewVertex);\n"
"vec3 h = normalize(sunVector + v);\n" // halfway vector
"finalData.rgb += vec3(specularCoefficient * pow(NdotHV,shininess));\n" "float NdotHV = max(dot(fsViewNormal,h),0.0);\n"
"}\n"
"}\n" "finalData.rgb += vec3(specularCoefficient * pow(NdotHV,shininess));\n"
"}\n"
"}\n"
"finalData.rgb = mix(finalData.rgb, fogColour, fsFogFactor);\n" "finalData.rgb = mix(finalData.rgb, fogColour, fsFogFactor);\n"
"gl_FragColor = finalData;\n" "gl_FragColor = finalData;\n"
"}\n"; "}\n";
R3DShader::R3DShader() R3DShader::R3DShader()