private static string MovC_(
char letter,
string target,
uint value)
{
return($"{target} = {DlShaderGenerator.CToValue_(letter, value)};" +
Environment.NewLine);
}
private int CreateFragmentShader_(
int cycles,
UnpackedCombiner combArg)
{
var newLine = '\n';
// TODO: Shade might need to be an "in" instead?
var fragmentHeaderLines =
@"#version 400
uniform float time;
uniform vec3 cameraPosition;
uniform float u_lightingEnabled;
uniform float u_sphericalUvEnabled;
uniform float u_linearUvEnabled;
struct TextureParams {
vec2 clamped;
vec2 mirrored;
vec2 maxUv;
};
uniform TextureParams textureParams0;
uniform TextureParams textureParams1;
uniform vec4 EnvColor;
uniform vec4 PrimColor;
uniform vec4 Blend;
uniform float PrimColorL;
uniform sampler2D texture0;
uniform sampler2D texture1;
in vec3 v_position;
in vec2 v_uv0;
in vec2 v_uv1;
in vec3 v_normal;
in vec3 v_projectedNormal;
in vec4 v_shade;
out vec4 outColor;" +
newLine;
fragmentHeaderLines += this.CreateUvMethods();
// TODO: Allow changing light position.
var fragmentMainLines =
@"vec4 applyLighting(vec4 p_color) {
vec3 ambientLightColor = vec3(1, 1, 1);
vec3 diffuseLightColor = vec3(1, 1, 1);
vec3 specularLightColor = vec3(1, 1, 1);
// Ambient color
float ambientLightStrength = .2;
vec3 ambientColor = ambientLightStrength * ambientLightColor;
// Diffuse color
vec3 normal = v_normal;
//vec3 lightPos = 10000 * vec3(1, 1, 1);
//vec3 lightDir = normalize(lightPos - v_position);
vec3 lightDir = normalize(vec3(-1, 0, 0));
float diff = max(dot(normal, lightDir), 0);
//float diff = .5 + .5 * dot(normal, lightDir);
vec3 diffuseColor = diff * diffuseLightColor;
// Specular color
float specularStrength = 0.5;
vec3 mergedColor = ambientColor + diffuseColor;
vec3 finalColor = mergedColor * p_color.rgb;
return vec4(finalColor, p_color.a);
}
vec4 calculateCcmuxColor(void) {
vec3 CCRegister_0;
vec3 CCRegister_1;
vec3 CCReg;
float ACRegister_0;
float ACRegister_1;
float ACReg;
vec3 projectedNormal = normalize(v_projectedNormal);
vec2 uv0 = calculateUv(v_uv0, textureParams0, projectedNormal);
vec2 uv1 = calculateUv(v_uv1, textureParams1, projectedNormal);
vec4 Texel0 = texture(texture0, uv0);
vec4 Texel1 = texture(texture1, uv1);" +
newLine;
for (var i = 0; i < cycles; ++i)
{
// Final color = (ColorA [base] - ColorB) * ColorC + ColorD
fragmentMainLines +=
DlShaderGenerator.MovC_('a',
"CCRegister_0",
combArg.cA[i]);
fragmentMainLines +=
DlShaderGenerator.MovC_('b',
"CCRegister_1",
combArg.cB[i]);
fragmentMainLines += "CCRegister_0 = CCRegister_0 - CCRegister_1;" +
newLine +
newLine;
fragmentMainLines +=
DlShaderGenerator.MovC_('c',
"CCRegister_1",
combArg.cC[i]);
fragmentMainLines += "CCRegister_0 = CCRegister_0 * CCRegister_1;" +
newLine;
fragmentMainLines +=
DlShaderGenerator.MovC_('d',
"CCRegister_1",
combArg.cD[i]);
fragmentMainLines += "CCRegister_0 = CCRegister_0 + CCRegister_1;" +
newLine +
newLine;
fragmentMainLines +=
DlShaderGenerator.MovA_('a', "ACRegister_0", combArg.aA[i]) +
newLine;
fragmentMainLines +=
DlShaderGenerator.MovA_('b', "ACRegister_1", combArg.aB[i]) +
newLine;
fragmentMainLines +=
"ACRegister_0 = ACRegister_0 - ACRegister_1;" +
newLine;
fragmentMainLines +=
DlShaderGenerator.MovA_('c', "ACRegister_1", combArg.aC[i]) +
newLine;
fragmentMainLines +=
"ACRegister_0 = ACRegister_0 * ACRegister_1;" +
newLine;
fragmentMainLines +=
DlShaderGenerator.MovA_('d', "ACRegister_1", combArg.aD[i]) +
newLine;
fragmentMainLines += "ACRegister_0 = ACRegister_0 + ACRegister_1;" +
newLine +
newLine;
fragmentMainLines += @"CCReg = CCRegister_0;
ACReg = ACRegister_0;" +
newLine;
}
// TODO: Is this the right shadow calculation?
fragmentMainLines +=
@"return vec4(CCReg, ACReg);
}
void main(void) {
vec4 ccmuxColor = calculateCcmuxColor();
outColor = mix(ccmuxColor, applyLighting(ccmuxColor), u_lightingEnabled);
}";
var fragmentShaderLines = fragmentHeaderLines + fragmentMainLines;
return(ShaderCompiler.Compile(Gl.GL_FRAGMENT_SHADER, fragmentShaderLines));
}