mirror of
https://github.com/RetroDECK/Supermodel.git
synced 2024-11-23 14:15:40 +00:00
399 lines
12 KiB
C++
399 lines
12 KiB
C++
#include "R3DShader.h"
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#include "Graphics/Shader.h"
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namespace New3D {
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static const char *vertexShaderBasic =
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// uniforms
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"uniform float fogIntensity;\n"
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"uniform float fogDensity;\n"
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"uniform float fogStart;\n"
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//outputs to fragment shader
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"varying float fsFogFactor;\n"
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"varying vec3 fsViewVertex;\n"
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"varying vec3 fsViewNormal;\n" // per vertex normal vector
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"varying vec4 fsColor;\n"
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"void main(void)\n"
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"{\n"
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"fsViewVertex = vec3(gl_ModelViewMatrix * gl_Vertex);\n"
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"fsViewNormal = normalize(gl_NormalMatrix *gl_Normal);\n"
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"float z = length(fsViewVertex);\n"
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"fsFogFactor = fogIntensity * clamp(fogStart + z * fogDensity, 0.0, 1.0);\n"
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"fsColor = gl_Color;\n"
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"gl_TexCoord[0] = gl_MultiTexCoord0;\n"
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"gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;\n"
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"}\n";
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static const char *fragmentShaderBasic =
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"uniform sampler2D tex1;\n" // base tex
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"uniform sampler2D tex2;\n" // micro tex (optional)
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"uniform int textureEnabled;\n"
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"uniform int microTexture;\n"
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"uniform float microTextureScale;\n"
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"uniform vec2 baseTexSize;\n"
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"uniform int alphaTest;\n"
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"uniform int textureAlpha;\n"
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"uniform vec3 fogColour;\n"
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"uniform vec4 spotEllipse;\n" // spotlight ellipse position: .x=X position (screen coordinates), .y=Y position, .z=half-width, .w=half-height)
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"uniform vec2 spotRange;\n" // spotlight Z range: .x=start (viewspace coordinates), .y=limit
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"uniform vec3 spotColor;\n" // spotlight RGB color
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"uniform vec3 spotFogColor;\n" // spotlight RGB color on fog
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"uniform vec3 lighting[2];\n" // lighting state (lighting[0] = sun direction, lighting[1].x,y = diffuse, ambient intensities from 0-1.0)
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"uniform int lightEnable;\n" // lighting enabled (1.0) or luminous (0.0), drawn at full intensity
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"uniform float specularCoefficient;\n" // specular coefficient
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"uniform float shininess;\n" // specular shininess
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"uniform float fogAttenuation;\n"
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"uniform float fogAmbient;\n"
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//interpolated inputs from vertex shader
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"varying float fsFogFactor;\n"
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"varying vec3 fsViewVertex;\n"
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"varying vec3 fsViewNormal;\n" // per vertex normal vector
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"varying vec4 fsColor;\n"
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"void main()\n"
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"{\n"
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"vec4 tex1Data;\n"
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"vec4 colData;\n"
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"vec4 finalData;\n"
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"vec4 fogData;\n"
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"bool discardFragment = false;\n"
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"fogData = vec4(fogColour.rgb * fogAmbient, fsFogFactor);\n"
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"tex1Data = vec4(1.0, 1.0, 1.0, 1.0);\n"
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"if(textureEnabled==1) {\n"
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"tex1Data = texture2D( tex1, gl_TexCoord[0].st);\n"
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"if (microTexture==1) {\n"
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"vec2 scale = baseTexSize/256.0;\n"
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"vec4 tex2Data = texture2D( tex2, gl_TexCoord[0].st * scale * microTextureScale);\n"
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"tex1Data = (tex1Data+tex2Data)/2.0;\n"
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"}\n"
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"if (alphaTest==1) {\n" // does it make any sense to do this later?
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"if (tex1Data.a < (8.0/16.0)) {\n"
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"discardFragment = true;\n"
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"}\n"
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"}\n"
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"if (textureAlpha == 0) {\n"
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"tex1Data.a = 1.0;\n"
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"}\n"
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"}\n"
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"colData = fsColor;\n"
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"finalData = tex1Data * colData;\n"
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"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
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"discardFragment = true;\n"
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"}\n"
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"if (discardFragment) {\n"
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"discard;\n"
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"}\n"
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"float ellipse;\n"
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"ellipse = length((gl_FragCoord.xy - spotEllipse.xy) / spotEllipse.zw);\n"
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"ellipse = pow(ellipse, 2.0);\n" // decay rate = square of distance from center
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"ellipse = 1.0 - ellipse;\n" // invert
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"ellipse = max(0.0, ellipse);\n" // clamp
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"if (lightEnable==1) {\n"
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"vec3 lightIntensity;\n"
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"vec3 sunVector;\n" // sun lighting vector (as reflecting away from vertex)
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"float sunFactor;\n" // sun light projection along vertex normal (0.0 to 1.0)
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// Real3D -> OpenGL view space convention (TO-DO: do this outside of shader)
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"sunVector = lighting[0] * vec3(1.0, -1.0, -1.0);\n"
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// Compute diffuse factor for sunlight
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"sunFactor = max(dot(sunVector, fsViewNormal), 0.0);\n"
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// Total light intensity: sum of all components
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"lightIntensity = vec3(sunFactor*lighting[1].x + lighting[1].y);\n" // ambient + diffuse
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"lightIntensity = clamp(lightIntensity,0.0,1.0);\n"
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// Compute spotlight and apply lighting
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"float enable, range, d;\n"
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"float inv_r = 1.0 / spotEllipse.z;\n" // slope of decay function
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"d = spotRange.x + spotRange.y + fsViewVertex.z;\n"
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"enable = step(spotRange.x + min(spotRange.y, 0.0), -fsViewVertex.z);\n"
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// inverse-linear falloff
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// Reference: https://imdoingitwrong.wordpress.com/2011/01/31/light-attenuation/
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// y = 1 / (d/r + 1)^2
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"range = 1.0 / pow(min(0.0, d * inv_r) - 1.0, 2.0);\n"
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"range = clamp(range, 0.0, 1.0);\n"
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"range *= enable;\n"
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"float lobeEffect = range * ellipse;\n"
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"lightIntensity.rgb += spotColor*lobeEffect;\n"
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"finalData.rgb *= lightIntensity;\n"
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"if (sunFactor > 0.0 && specularCoefficient > 0.0) {\n"
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"float nDotL = max(dot(fsViewNormal,sunVector),0.0);\n"
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"finalData.rgb += vec3(specularCoefficient * pow(nDotL,shininess));\n"
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"}\n"
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"}\n"
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// Spotlight on fog
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"vec3 lSpotFogColor = spotFogColor * ellipse * fogColour.rgb;\n"
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// Fog & spotlight applied
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"finalData.rgb = mix(finalData.rgb, lSpotFogColor * fogAttenuation + fogData.rgb, fogData.a);\n"
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"gl_FragColor = finalData;\n"
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"}\n";
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R3DShader::R3DShader()
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{
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m_shaderProgram = 0;
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m_vertexShader = 0;
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m_fragmentShader = 0;
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Start(); // reset attributes
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}
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void R3DShader::Start()
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{
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m_textured1 = false;
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m_textured2 = false;
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m_textureAlpha = false; // use alpha in texture
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m_alphaTest = false; // discard fragment based on alpha (ogl does this with fixed function)
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m_doubleSided = false;
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m_lightEnabled = false;
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m_layered = false;
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m_baseTexSize[0] = 0;
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m_baseTexSize[1] = 0;
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m_shininess = 0;
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m_specularCoefficient = 0;
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m_microTexScale = 0;
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m_matDet = MatDet::notset;
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m_dirtyMesh = true; // dirty means all the above are dirty, ie first run
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m_dirtyModel = true;
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}
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bool R3DShader::LoadShader(const char* vertexShader, const char* fragmentShader)
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{
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const char* vShader;
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const char* fShader;
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bool success;
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if (vertexShader) {
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vShader = vertexShader;
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}
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else {
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vShader = vertexShaderBasic;
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}
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if (fragmentShader) {
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fShader = fragmentShader;
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}
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else {
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fShader = fragmentShaderBasic;
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}
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success = LoadShaderProgram(&m_shaderProgram, &m_vertexShader, &m_fragmentShader, std::string(), std::string(), vShader, fShader);
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m_locTexture1 = glGetUniformLocation(m_shaderProgram, "tex1");
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m_locTexture2 = glGetUniformLocation(m_shaderProgram, "tex2");
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m_locTexture1Enabled= glGetUniformLocation(m_shaderProgram, "textureEnabled");
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m_locTexture2Enabled= glGetUniformLocation(m_shaderProgram, "microTexture");
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m_locTextureAlpha = glGetUniformLocation(m_shaderProgram, "textureAlpha");
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m_locAlphaTest = glGetUniformLocation(m_shaderProgram, "alphaTest");
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m_locMicroTexScale = glGetUniformLocation(m_shaderProgram, "microTextureScale");
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m_locBaseTexSize = glGetUniformLocation(m_shaderProgram, "baseTexSize");
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m_locFogIntensity = glGetUniformLocation(m_shaderProgram, "fogIntensity");
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m_locFogDensity = glGetUniformLocation(m_shaderProgram, "fogDensity");
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m_locFogStart = glGetUniformLocation(m_shaderProgram, "fogStart");
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m_locFogColour = glGetUniformLocation(m_shaderProgram, "fogColour");
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m_locFogAttenuation = glGetUniformLocation(m_shaderProgram, "fogAttenuation");
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m_locFogAmbient = glGetUniformLocation(m_shaderProgram, "fogAmbient");
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m_locLighting = glGetUniformLocation(m_shaderProgram, "lighting");
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m_locLightEnable = glGetUniformLocation(m_shaderProgram, "lightEnable");
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m_locShininess = glGetUniformLocation(m_shaderProgram, "shininess");
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m_locSpecCoefficient= glGetUniformLocation(m_shaderProgram, "specularCoefficient");
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m_locSpotEllipse = glGetUniformLocation(m_shaderProgram, "spotEllipse");
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m_locSpotRange = glGetUniformLocation(m_shaderProgram, "spotRange");
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m_locSpotColor = glGetUniformLocation(m_shaderProgram, "spotColor");
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m_locSpotFogColor = glGetUniformLocation(m_shaderProgram, "spotFogColor");
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return success;
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}
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void R3DShader::SetShader(bool enable)
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{
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if (enable) {
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glUseProgram(m_shaderProgram);
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Start();
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}
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else {
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glUseProgram(0);
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}
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}
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void R3DShader::SetMeshUniforms(const Mesh* m)
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{
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if (m == nullptr) {
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return; // sanity check
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}
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if (m_dirtyMesh) {
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glUniform1i(m_locTexture1, 0);
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glUniform1i(m_locTexture2, 1);
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}
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if (m_dirtyMesh || m->textured != m_textured1) {
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glUniform1i(m_locTexture1Enabled, m->textured);
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m_textured1 = m->textured;
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}
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if (m_dirtyMesh || m->microTexture != m_textured2) {
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glUniform1i(m_locTexture2Enabled, m->microTexture);
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m_textured2 = m->microTexture;
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}
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if (m_dirtyMesh || m->microTextureScale != m_microTexScale) {
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glUniform1f(m_locMicroTexScale, m->microTextureScale);
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m_microTexScale = m->microTextureScale;
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}
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if (m_dirtyMesh || m->microTexture && (m_baseTexSize[0] != m->width || m_baseTexSize[1] != m->height)) {
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m_baseTexSize[0] = (float)m->width;
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m_baseTexSize[1] = (float)m->height;
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glUniform2fv(m_locBaseTexSize, 1, m_baseTexSize);
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}
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if (m_dirtyMesh || m->alphaTest != m_alphaTest) {
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glUniform1i(m_locAlphaTest, m->alphaTest);
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m_alphaTest = m->alphaTest;
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}
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if (m_dirtyMesh || m->textureAlpha != m_textureAlpha) {
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glUniform1i(m_locTextureAlpha, m->textureAlpha);
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m_textureAlpha = m->textureAlpha;
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}
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if (m_dirtyMesh || m->fogIntensity != m_fogIntensity) {
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glUniform1f(m_locFogIntensity, m->fogIntensity);
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m_fogIntensity = m->fogIntensity;
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}
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if (m_dirtyMesh || m->lighting != m_lightEnabled) {
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glUniform1i(m_locLightEnable, m->lighting);
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m_lightEnabled = m->lighting;
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}
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if (m_dirtyMesh || m->shininess != m_shininess) {
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glUniform1f(m_locShininess, (m->shininess + 1) * 4);
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m_shininess = m->shininess;
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}
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if (m_dirtyMesh || m->specularCoefficient != m_specularCoefficient) {
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glUniform1f(m_locSpecCoefficient, m->specularCoefficient);
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m_specularCoefficient = m->specularCoefficient;
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}
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if (m_dirtyMesh || m->layered != m_layered) {
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m_layered = m->layered;
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if (m_layered) {
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glEnable(GL_STENCIL_TEST);
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}
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else {
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glDisable(GL_STENCIL_TEST);
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}
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}
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if (m_matDet!=MatDet::zero) {
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if (m_dirtyMesh || m->doubleSided != m_doubleSided) {
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m_doubleSided = m->doubleSided;
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if (m_doubleSided) {
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glDisable(GL_CULL_FACE);
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}
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else {
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glEnable(GL_CULL_FACE);
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}
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}
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}
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m_dirtyMesh = false;
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}
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void R3DShader::SetViewportUniforms(const Viewport *vp)
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{
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//didn't bother caching these, they don't get frequently called anyway
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glUniform1f (m_locFogDensity, vp->fogParams[3]);
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glUniform1f (m_locFogStart, vp->fogParams[4]);
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glUniform3fv(m_locFogColour, 1, vp->fogParams);
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glUniform1f (m_locFogAttenuation, vp->fogParams[5]);
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glUniform1f (m_locFogAmbient, vp->fogParams[6]);
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glUniform3fv(m_locLighting, 2, vp->lightingParams);
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glUniform4fv(m_locSpotEllipse, 1, vp->spotEllipse);
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glUniform2fv(m_locSpotRange, 1, vp->spotRange);
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glUniform3fv(m_locSpotColor, 1, vp->spotColor);
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glUniform3fv(m_locSpotFogColor, 1, vp->spotFogColor);
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}
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void R3DShader::SetModelStates(const Model* model)
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{
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//==========
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MatDet test;
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//==========
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test = MatDet::notset; // happens for bad matrices with NaN
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if (model->determinant < 0) { test = MatDet::negative; }
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else if (model->determinant > 0) { test = MatDet::positive; }
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else if (model->determinant == 0) { test = MatDet::zero; }
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if (m_dirtyModel || m_matDet!=test) {
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switch (test) {
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case MatDet::negative:
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glCullFace(GL_FRONT);
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glEnable(GL_CULL_FACE);
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m_doubleSided = false;
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break;
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case MatDet::positive:
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glCullFace(GL_BACK);
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glEnable(GL_CULL_FACE);
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m_doubleSided = false;
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break;
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default:
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glDisable(GL_CULL_FACE);
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m_doubleSided = true; // basically drawing on both sides now
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}
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}
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m_matDet = test;
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m_dirtyModel = false;
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}
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} // New3D
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