public static void parse(String url, String src, OnShadersParsed onload)
{
List <shader_t> shaders = new List <shader_t>();
ShaderTokenizer tokens = new ShaderTokenizer(src);
// Parse a shader
while (!tokens.EOF())
{
String name = tokens.next();
shader_t shader = ShaderParser.parseShader(name, tokens);
if (shader != null)
{
shader.url = url;
if (shader.stages != null)
{
for (var i = 0; i < shader.stages.Count; ++i)
{
// Build a OpenGL shader program out of the stage parameters set here
shader.stages[i].shaderSrc = ShaderParser.buildShaderSource(shader, shader.stages[i]);
}
}
}
shaders.Add(shader);
}
// Send shaders to gl Thread
onload(shaders);
}
//
// WebGL Shader creation
//
// This whole section is a bit ugly, but it gets the job done. The job, in this case, is translating
// Quake 3 shaders into GLSL shader programs. We should probably be doing a bit more normalization here.
public static shader_src_t buildShaderSource(shader_t shader, stage_t stage)
{
shader_src_t src = new shader_src_t();
src.vertex = ShaderParser.buildVertexShader(shader, stage);
src.fragment = ShaderParser.buildFragmentShader(shader, stage);
return(src);
}
public static shader_t parseShader(String name, ShaderTokenizer tokens)
{
string param;
String brace = tokens.next();
if (brace != "{")
{
return(null);
}
shader_t shader = new shader_t();
shader.name = name;
// Parse a shader
while (!tokens.EOF())
{
String token = tokens.next().ToLower();
if (token == "}")
{
break;
}
switch (token)
{
case "{":
{
stage_t stage = ShaderParser.parseStage(tokens);
// I really really really don't like doing this, which basically just forces lightmaps to use the 'filter' blendmode
// but if I don't a lot of textures end up looking too bright. I'm sure I'm jsut missing something, and this shouldn't
// be needed.
if (stage.isLightmap == true && (stage.hasBlendFunc == true))
{
stage.blendSrc = "GL_DST_COLOR";
stage.blendDest = "GL_ZERO";
}
// I'm having a ton of trouble getting lightingSpecular to work properly,
// so this little hack gets it looking right till I can figure out the problem
if (stage.alphaGen == "lightingspecular")
{
stage.blendSrc = "GL_ONE";
stage.blendDest = "GL_ZERO";
stage.hasBlendFunc = false;
stage.depthWrite = true;
shader.stages = new List <stage_t>();
}
if (stage.hasBlendFunc == true)
{
shader.blend = true;
}
else
{
shader.opaque = true;
}
shader.stages.Add(stage);
}
break;
case "cull":
shader.cull = tokens.next();
break;
case "deformvertexes":
deform_t deform = new deform_t();
deform.type = tokens.next().ToLower();
switch (deform.type)
{
case "wave":
deform.spread = 1.0 / double.Parse(tokens.next());
deform.waveform = ShaderParser.parseWaveform(tokens);
break;
default: deform = null; break;
}
if (deform != null)
{
shader.vertexDeforms.Add(deform);
}
break;
case "sort":
String sort = tokens.next().ToLower();
switch (sort)
{
case "portal": shader.sort = 1; break;
case "sky": shader.sort = 2; break;
case "opaque": shader.sort = 3; break;
case "banner": shader.sort = 6; break;
case "underwater": shader.sort = 8; break;
case "additive": shader.sort = 9; break;
case "nearest": shader.sort = 16; break;
default: shader.sort = int.Parse(sort); break;
}
;
break;
case "surfaceparm":
param = tokens.next().ToLower();
switch (param)
{
case "sky":
shader.sky = true;
break;
default: break;
}
break;
case "skyparms":
param = tokens.next().ToLower();
shader.sky_env_map = new sky_env_map_p(param);;
break;
default: break;
}
}
if (shader.sort < 0 || shader.sort == 0)
{
shader.sort = (shader.opaque ? 3 : 9);
}
//if(!shader['sort']) {
//shader['sort'] = (shader['opaque'] ? 3 : 9);
//}
return(shader);
}
public static fragment_shader_src_t buildFragmentShader(shader_t stageShader, stage_t stage)
{
ShaderBuilder shader = new ShaderBuilder();
shader.addVaryings("vTexCoord", "vec2");
shader.addVaryings("vColor", "vec4");
shader.addUniforms("texture", "sampler2D");
shader.addUniforms("time", "float");
shader.addLines("vec4 texColor = texture2D(texture, vTexCoord.st);");
switch (stage.rgbGen)
{
case "vertex":
shader.addLines("vec3 rgb = texColor.rgb * vColor.rgb;");
break;
case "wave":
shader.addWaveform("rgbWave", stage.rgbWaveform, null);
shader.addLines("vec3 rgb = texColor.rgb * rgbWave;");
break;
default:
shader.addLines("vec3 rgb = texColor.rgb;");
break;
}
switch (stage.alphaGen)
{
case "wave":
shader.addWaveform("alpha", stage.alphaWaveform, null);
break;
case "lightingspecular":
// For now this is VERY special cased. May not work well with all instances of lightingSpecular
shader.addUniforms("lightmap", "sampler2D");
shader.addVaryings("vLightCoord", "vec2");
shader.addVaryings("vLight", "float");
shader.addLines(
"vec4 light = texture2D(lightmap, vLightCoord.st);",
"rgb *= light.rgb;",
"rgb += light.rgb * texColor.a * 0.6;", // This was giving me problems, so I'm ignorning an actual specular calculation for now
"float alpha = 1.0;"
);
break;
default:
shader.addLines("float alpha = texColor.a;");
break;
}
if (stage.alphaFunc != null)
{
switch (stage.alphaFunc)
{
case "GT0":
shader.addLines("if(alpha == 0.0) { discard; }");
break;
case "LT128":
shader.addLines("if(alpha >= 0.5) { discard; }");
break;
case "GE128":
shader.addLines("if(alpha < 0.5) { discard; }");
break;
default:
break;
}
}
shader.addLines("gl_FragColor = vec4(rgb, alpha);");
fragment_shader_src_t frag_shader = new fragment_shader_src_t();
frag_shader.source_code = shader.getSource();
return(frag_shader);
}
public static vertex_shader_src_t buildVertexShader(shader_t stageShader, stage_t stage)
{
ShaderBuilder shader;
Dictionary <string, string> attribs, varyings, uniforms;
List <string> statements;
shader = new ShaderBuilder();
attribs = new Dictionary <string, string>();
varyings = new Dictionary <string, string>();
uniforms = new Dictionary <string, string>();
statements = new List <string>();
shader.addAttribs("position", "vec3");
shader.addAttribs("normal", "vec3");
shader.addAttribs("color", "vec4");
shader.addVaryings("vTexCoord", "vec2");
shader.addVaryings("vColor", "vec4");
shader.addUniforms("modelViewMat", "mat4");
shader.addUniforms("projectionMat", "mat4");
shader.addUniforms("time", "float");
if (stage.isLightmap == true)
{
shader.addAttribs("lightCoord", "vec2");
}
else
{
shader.addAttribs("texCoord", "vec2");
}
shader.addLines("vec3 defPosition = position;");
//shader.addAttribs(attribs);
//shader.addVaryings(varyings);
//shader.addUniforms(uniforms);
//shader.addLines(statements);
for (int i = 0; i < stageShader.vertexDeforms.Count; ++i)
{
deform_t deform = stageShader.vertexDeforms[i];
switch (deform.type)
{
case "wave":
String name = "deform" + i.ToString();
String offName = "deformOff" + i.ToString();
shader.addLine("float " + offName + " = (position.x + position.y + position.z) * " + ShaderBuilder.toStringAsFixed(deform.spread, 4) + ";");
var phase = deform.waveform.phase;
deform.waveform.phase = ShaderBuilder.toStringAsFixed((double)phase, 4) + " + " + offName;
shader.addWaveform(name, deform.waveform, null);
deform.waveform.phase = phase;
shader.addLine("defPosition += normal * " + name + ";");
break;
default: break;
}
}
shader.addLine("vec4 worldPosition = modelViewMat * vec4(defPosition, 1.0);");
shader.addLine("vColor = color;");
if (stage.tcGen == "environment")
{
shader.addLines(
"vec3 viewer = normalize(-worldPosition.xyz);",
"float d = dot(normal, viewer);",
"vec3 reflected = normal*2.0*d - viewer;",
"vTexCoord = vec2(0.5, 0.5) + reflected.xy * 0.5;"
);
}
else
{
// Standard texturing
if (stage.isLightmap == true)
{
shader.addLines("vTexCoord = lightCoord;");
}
else
{
shader.addLines("vTexCoord = texCoord;");
}
}
// tcMods
for (int i = 0; i < stage.tcMods.Count; ++i)
{
tcMod_t tcMod = stage.tcMods[i];
switch (tcMod.type)
{
case "rotate":
shader.addLines(
string.Format("float r = {0} * time;", ShaderBuilder.toStringAsFixed(tcMod.angle, 4)),
"vTexCoord -= vec2(0.5, 0.5);",
"vTexCoord = vec2(vTexCoord.s * cos(r) - vTexCoord.t * sin(r), vTexCoord.t * cos(r) + vTexCoord.s * sin(r));",
"vTexCoord += vec2(0.5, 0.5);"
);
break;
case "scroll":
double sSpeed = tcMod.sSpeed; // was tcMod['sSpeed'].toFixed(4)
double tSpeed = tcMod.tSpeed;
shader.addLines(string.Format("vTexCoord += vec2({0} * time, {1} * time); ", ShaderBuilder.toStringAsFixed(sSpeed, 4), ShaderBuilder.toStringAsFixed(tSpeed, 4)));
break;
case "scale":
double scaleX = tcMod.scaleX;
double scaleY = tcMod.scaleY;
shader.addLines("vTexCoord *= vec2(" + ShaderBuilder.toStringAsFixed(scaleX, 4) + ", " + ShaderBuilder.toStringAsFixed(scaleY, 4) + ");");
break;
case "stretch":
shader.addWaveform("stretchWave", tcMod.waveform, null);
shader.addLines(
"stretchWave = 1.0 / stretchWave;",
"vTexCoord *= stretchWave;",
"vTexCoord += vec2(0.5 - (0.5 * stretchWave), 0.5 - (0.5 * stretchWave));"
);
break;
case "turb":
String tName = "turbTime" + i.ToString();
shader.addLines(
"float " + tName + " = " + ShaderBuilder.toStringAsFixed(tcMod.turbulance.phase, 4) + " + time * " + ShaderBuilder.toStringAsFixed(tcMod.turbulance.freq, 4) + ";",
"vTexCoord.s += sin( ( ( position.x + position.z )* 1.0/128.0 * 0.125 + " + tName + " ) * 6.283) * " + ShaderBuilder.toStringAsFixed(tcMod.turbulance.amp, 4) + ';',
"vTexCoord.t += sin( ( position.y * 1.0/128.0 * 0.125 + " + tName + " ) * 6.283) * " + ShaderBuilder.toStringAsFixed(tcMod.turbulance.amp, 4) + ";"
);
break;
default: break;
}
}
switch (stage.alphaGen)
{
case "lightingspecular":
shader.addAttribs("lightCoord", "vec2");
shader.addVaryings("vLightCoord", "vec2");
shader.addLines("vLightCoord = lightCoord;");
break;
default:
break;
}
shader.addLines("gl_Position = projectionMat * worldPosition;");
vertex_shader_src_t vertex_shader = new vertex_shader_src_t();
vertex_shader.source_code = shader.getSource();
return(vertex_shader);
}