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// Vertex shader definition to embed, no external file required
static const char vStandardShaderStr[] =
#if defined(GRAPHICS_API_OPENGL_21)
"#version 120 \n"
#elif defined(GRAPHICS_API_OPENGL_ES2)
"#version 100 \n"
#endif
#if defined(GRAPHICS_API_OPENGL_ES2) || defined(GRAPHICS_API_OPENGL_21)
"attribute vec3 vertexPosition; \n"
"attribute vec3 vertexNormal; \n"
"attribute vec2 vertexTexCoord; \n"
"attribute vec4 vertexColor; \n"
"varying vec3 fragPosition; \n"
"varying vec3 fragNormal; \n"
"varying vec2 fragTexCoord; \n"
"varying vec4 fragColor; \n"
#elif defined(GRAPHICS_API_OPENGL_33)
"#version 330 \n"
"in vec3 vertexPosition; \n"
"in vec3 vertexNormal; \n"
"in vec2 vertexTexCoord; \n"
"in vec4 vertexColor; \n"
"out vec3 fragPosition; \n"
"out vec3 fragNormal; \n"
"out vec2 fragTexCoord; \n"
"out vec4 fragColor; \n"
#endif
"uniform mat4 mvpMatrix; \n"
"void main() \n"
"{ \n"
" fragPosition = vertexPosition; \n"
" fragNormal = vertexNormal; \n"
" fragTexCoord = vertexTexCoord; \n"
" fragColor = vertexColor; \n"
" gl_Position = mvpMatrix*vec4(vertexPosition, 1.0); \n"
"} \n";
// Fragment shader definition to embed, no external file required
static const char fStandardShaderStr[] =
#if defined(GRAPHICS_API_OPENGL_21)
"#version 120 \n"
#elif defined(GRAPHICS_API_OPENGL_ES2)
"#version 100 \n"
"precision mediump float; \n" // precision required for OpenGL ES2 (WebGL)
#endif
#if defined(GRAPHICS_API_OPENGL_ES2) || defined(GRAPHICS_API_OPENGL_21)
"varying vec3 fragPosition; \n"
"varying vec3 fragNormal; \n"
"varying vec2 fragTexCoord; \n"
"varying vec4 fragColor; \n"
#elif defined(GRAPHICS_API_OPENGL_33)
"#version 330 \n"
"in vec3 fragPosition; \n"
"in vec3 fragNormal; \n"
"in vec2 fragTexCoord; \n"
"in vec4 fragColor; \n"
"out vec4 finalColor; \n"
#endif
"uniform sampler2D texture0; \n"
"uniform sampler2D texture1; \n"
"uniform sampler2D texture2; \n"
"uniform vec4 colAmbient; \n"
"uniform vec4 colDiffuse; \n"
"uniform vec4 colSpecular; \n"
"uniform float glossiness; \n"
"uniform int useNormal; \n"
"uniform int useSpecular; \n"
"uniform mat4 modelMatrix; \n"
"uniform vec3 viewDir; \n"
"struct Light { \n"
" int enabled; \n"
" int type; \n"
" vec3 position; \n"
" vec3 direction; \n"
" vec4 diffuse; \n"
" float intensity; \n"
" float radius; \n"
" float coneAngle; }; \n"
"const int maxLights = 8; \n"
"uniform Light lights[maxLights]; \n"
"\n"
"vec3 CalcPointLight(Light l, vec3 n, vec3 v, float s) \n"
"{\n"
" vec3 surfacePos = vec3(modelMatrix*vec4(fragPosition, 1));\n"
" vec3 surfaceToLight = l.position - surfacePos;\n"
" float brightness = clamp(float(dot(n, surfaceToLight)/(length(surfaceToLight)*length(n))), 0.0, 1.0);\n"
" float diff = 1.0/dot(surfaceToLight/l.radius, surfaceToLight/l.radius)*brightness*l.intensity;\n"
" float spec = 0.0;\n"
" if (diff > 0.0)\n"
" {\n"
" vec3 h = normalize(-l.direction + v);\n"
" spec = pow(dot(n, h), 3.0 + glossiness)*s;\n"
" }\n"
" return (diff*l.diffuse.rgb + spec*colSpecular.rgb);\n"
"}\n"
"\n"
"vec3 CalcDirectionalLight(Light l, vec3 n, vec3 v, float s)\n"
"{\n"
" vec3 lightDir = normalize(-l.direction);\n"
" float diff = clamp(float(dot(n, lightDir)), 0.0, 1.0)*l.intensity;\n"
" float spec = 0.0;\n"
" if (diff > 0.0)\n"
" {\n"
" vec3 h = normalize(lightDir + v);\n"
" spec = pow(dot(n, h), 3.0 + glossiness)*s;\n"
" }\n"
" return (diff*l.intensity*l.diffuse.rgb + spec*colSpecular.rgb);\n"
"}\n"
"\n"
"vec3 CalcSpotLight(Light l, vec3 n, vec3 v, float s)\n"
"{\n"
" vec3 surfacePos = vec3(modelMatrix*vec4(fragPosition, 1.0));\n"
" vec3 lightToSurface = normalize(surfacePos - l.position);\n"
" vec3 lightDir = normalize(-l.direction);\n"
" float diff = clamp(float(dot(n, lightDir)), 0.0, 1.0)*l.intensity;\n"
" float attenuation = clamp(float(dot(n, lightToSurface)), 0.0, 1.0);\n"
" attenuation = dot(lightToSurface, -lightDir);\n"
" float lightToSurfaceAngle = degrees(acos(attenuation));\n"
" if (lightToSurfaceAngle > l.coneAngle) attenuation = 0.0;\n"
" float falloff = (l.coneAngle - lightToSurfaceAngle)/l.coneAngle;\n"
" float diffAttenuation = diff*attenuation;\n"
" float spec = 0.0;\n"
" if (diffAttenuation > 0.0)\n"
" {\n"
" vec3 h = normalize(lightDir + v);\n"
" spec = pow(dot(n, h), 3.0 + glossiness)*s;\n"
" }\n"
" return (falloff*(diffAttenuation*l.diffuse.rgb + spec*colSpecular.rgb));\n"
"}\n"
"\n"
"void main()\n"
"{\n"
" mat3 normalMatrix = mat3(modelMatrix);\n"
" vec3 normal = normalize(normalMatrix*fragNormal);\n"
" vec3 n = normalize(normal);\n"
" vec3 v = normalize(viewDir);\n"
#if defined(GRAPHICS_API_OPENGL_ES2) || defined(GRAPHICS_API_OPENGL_21)
" vec4 texelColor = texture2D(texture0, fragTexCoord);\n"
#elif defined(GRAPHICS_API_OPENGL_33)
" vec4 texelColor = texture(texture0, fragTexCoord);\n"
#endif
" vec3 lighting = colAmbient.rgb;\n"
" if (useNormal == 1)\n"
" {\n"
#if defined(GRAPHICS_API_OPENGL_ES2) || defined(GRAPHICS_API_OPENGL_21)
" n *= texture2D(texture1, fragTexCoord).rgb;\n"
#elif defined(GRAPHICS_API_OPENGL_33)
" n *= texture(texture1, fragTexCoord).rgb;\n"
#endif
" n = normalize(n);\n"
" }\n"
" float spec = 1.0;\n"
#if defined(GRAPHICS_API_OPENGL_ES2) || defined(GRAPHICS_API_OPENGL_21)
" if (useSpecular == 1) spec *= normalize(texture2D(texture2, fragTexCoord).r);\n"
#elif defined(GRAPHICS_API_OPENGL_33)
" if (useSpecular == 1) spec *= normalize(texture(texture2, fragTexCoord).r);\n"
#endif
" for (int i = 0; i < maxLights; i++)\n"
" {\n"
" if (lights[i].enabled == 1)\n"
" {\n"
" if(lights[i].type == 0) lighting += CalcPointLight(lights[i], n, v, spec);\n"
" else if(lights[i].type == 1) lighting += CalcDirectionalLight(lights[i], n, v, spec);\n"
" else if(lights[i].type == 2) lighting += CalcSpotLight(lights[i], n, v, spec);\n"
" }\n"
" }\n"
#if defined(GRAPHICS_API_OPENGL_ES2) || defined(GRAPHICS_API_OPENGL_21)
" gl_FragColor = vec4(texelColor.rgb*lighting*colDiffuse.rgb, texelColor.a*colDiffuse.a); \n"
#elif defined(GRAPHICS_API_OPENGL_33)
" finalColor = vec4(texelColor.rgb*lighting*colDiffuse.rgb, texelColor.a*colDiffuse.a); \n"
#endif
"}\n";
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