2018-02-08 23:40:26 +00:00
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// Hyperbolic Rogue -- basic GL transformations
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// If CAP_SHADER is 0, OpenGL 1.0 is used.
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// If CAP_SHADER is 1, GLSL is used.
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// Copyright (C) 2011-2018 Zeno Rogue, see 'hyper.cpp' for details
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2018-02-08 23:29:20 +00:00
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// #undef CAP_SHADER
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// #define CAP_SHADER 0
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namespace glhr {
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enum mode { gmColored, gmTextured, gmMAX};
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struct glmatrix {
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GLfloat a[4][4];
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GLfloat* operator[] (int i) { return a[i]; }
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GLfloat* as_array() { return a[0]; }
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const GLfloat* as_array() const { return a[0]; }
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};
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glmatrix operator * (glmatrix m1, glmatrix m2) {
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glmatrix res;
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for(int i=0; i<4; i++)
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for(int j=0; j<4; j++) {
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res[i][j] = 0;
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for(int k=0; k<4; k++)
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res[i][j] += m1[i][k] * m2[k][j];
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}
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return res;
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}
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glmatrix id() {
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glmatrix M;
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for(int i=0; i<4; i++)
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for(int j=0; j<4; j++)
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M[i][j] = (i == j);
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return M;
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}
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glmatrix scale(ld x, ld y, ld z) {
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glmatrix tmp;
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for(int i=0; i<4; i++)
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for(int j=0; j<4; j++)
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tmp[i][j] = (i==j);
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tmp[0][0] = x;
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tmp[1][1] = y;
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tmp[2][2] = z;
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return tmp;
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}
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glmatrix translate(ld x, ld y, ld z) {
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glmatrix tmp;
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for(int i=0; i<4; i++)
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for(int j=0; j<4; j++)
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tmp[i][j] = (i==j);
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tmp[3][0] = x;
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tmp[3][1] = y;
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tmp[3][2] = z;
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return tmp;
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}
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glmatrix& as_glmatrix(GLfloat o[16]) {
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glmatrix& tmp = (glmatrix&) (o[0]);
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return tmp;
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}
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// ** legacy **
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#if !CAP_SHADER
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void new_projection() {
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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}
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void projection_multiply(const glmatrix& m) {
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glMultMatrixf(m.as_array());
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}
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void set_modelview(const glmatrix& m) {
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glMatrixMode(GL_MODELVIEW);
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glLoadMatrixf(m.as_array());
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}
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void be_nontextured() { }
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void be_textured() { }
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void init() { }
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#endif
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// /* shaders */
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#if CAP_SHADER
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glmatrix projection;
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void new_projection() {
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projection = id();
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}
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void projection_multiply(const glmatrix& m) {
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projection = m * projection;
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}
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#define glMatrixMode DISABLED
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#define glLoadIdentity DISABLED
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#define glMultMatrixf DISABLED
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#define glScalef DISABLED
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#define glTranslatef DISABLED
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#define glPushMatrix DISABLED
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#define glPopMatrix DISABLED
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void init();
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int compileShader(int type, const char* s) {
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GLint status;
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GLint shader = glCreateShader(type);
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glShaderSource(shader, 1, &s, NULL);
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glCompileShader(shader);
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GLint logLength;
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glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &logLength);
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if (logLength > 0) {
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char log[logLength];
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glGetShaderInfoLog(shader, logLength, &logLength, log);
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if(logLength > 0)
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printf("compiler log (%d): '%s'\n", logLength, log);
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}
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glGetShaderiv(shader, GL_COMPILE_STATUS, &status);
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if (status == 0) {
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glDeleteShader(shader);
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printf("failed to compile shader\n");
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shader = 0;
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}
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return shader;
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}
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// https://www.opengl.org/sdk/docs/tutorials/ClockworkCoders/attributes.php
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struct GLprogram *current = NULL;
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enum {
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UNIFORM_MODELVIEWPROJECTION_MATRIX,
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UNIFORM_NORMAL_MATRIX,
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NUM_UNIFORMS
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};
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struct GLprogram {
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GLuint _program;
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GLuint vertShader, fragShader;
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GLint uniforms[NUM_UNIFORMS];
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GLprogram(string vsh, string fsh) {
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_program = glCreateProgram();
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printf("creating program %d\n", _program);
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vertShader = compileShader(GL_VERTEX_SHADER, vsh.c_str());
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fragShader = compileShader(GL_FRAGMENT_SHADER, fsh.c_str());
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// Attach vertex shader to program.
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glAttachShader(_program, vertShader);
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// Attach fragment shader to program.
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glAttachShader(_program, fragShader);
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GLint status;
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glLinkProgram(_program);
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GLint logLength;
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glGetProgramiv(_program, GL_INFO_LOG_LENGTH, &logLength);
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if (logLength > 0) {
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char log[logLength];
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glGetProgramInfoLog(_program, logLength, &logLength, log);
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if(logLength > 0)
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printf("linking log (%d): %s\n", logLength, log);
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}
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glGetProgramiv(_program, GL_LINK_STATUS, &status);
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if (status == 0) {
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printf("failed to link shader\n");
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exit(1);
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}
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// glBindAttribLocation(_program, GLKVertexAttribPosition, "position"); ??
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// glBindAttribLocation(_program, GLKVertexAttribNormal, "normal"); ??
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uniforms[UNIFORM_MODELVIEWPROJECTION_MATRIX] = glGetUniformLocation(_program, "modelViewProjectionMatrix");
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uniforms[UNIFORM_NORMAL_MATRIX] = glGetUniformLocation(_program, "normalMatrix");
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printf("uniforms: %d %d\n", uniforms[UNIFORM_MODELVIEWPROJECTION_MATRIX], uniforms[UNIFORM_NORMAL_MATRIX]);
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}
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~GLprogram() {
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glDeleteProgram(_program);
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if(vertShader) glDeleteShader(vertShader), vertShader = 0;
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if(fragShader) glDeleteShader(fragShader), fragShader = 0;
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current = NULL;
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}
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void enable() {
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if(this != current) {
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glUseProgram(_program);
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current = this;
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}
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}
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};
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GLprogram *textured, *nontextured;
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void init() {
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projection = id();
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for(int i=0; i<2; i++) {
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auto texture_only = [=] (string s) -> string { if(i) return s; else return ""; };
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auto not_texture_only = [=] (string s) -> string { if(!i) return s; else return ""; };
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(i==1?textured:nontextured) = new GLprogram(
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// "attribute vec4 position;"
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// "attribute vec3 normal;"
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"varying vec4 vColor;"
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+ texture_only( "varying vec2 vTexCoord;" ) +
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"uniform mat4 modelViewProjectionMatrix;"
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"uniform mat3 normalMatrix;"
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"void main() {"
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// "vec3 eyeNormal = normalize(normalMatrix * normal);"
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// "vec3 lightPosition = vec3(0.0, 0.0, 1.0);"
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// "vec4 diffuseColor = vec4(0.4, 0.4, 1.0, 1.0);"
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// "float nDotVP = max(0.0, dot(eyeNormal, normalize(lightPosition)));"
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// "vColor = diffuseColor * nDotVP;"
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+ texture_only("vTexCoord = gl_MultiTexCoord0.xy;") +
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"vColor = gl_Color;"
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"gl_Position = modelViewProjectionMatrix * gl_Vertex;"
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"}",
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"uniform sampler2D myTexture;"
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"varying vec4 vColor;"
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+ texture_only( "varying vec2 vTexCoord;" ) +
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"void main() {"
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+ texture_only(" gl_FragColor = vColor * texture2D(myTexture, vTexCoord);")
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+ not_texture_only(" gl_FragColor = vColor;") +
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" }"
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);
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}
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nontextured->enable();
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}
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void set_modelview(const glmatrix& modelview) {
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glmatrix mvp = modelview * projection;
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glUniformMatrix4fv(current->uniforms[UNIFORM_MODELVIEWPROJECTION_MATRIX], 1, 0, mvp.as_array());
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// glmatrix nm = modelview;
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// glUniformMatrix3fv(current->uniforms[UNIFORM_NORMAL_MATRIX], 1, 0, nm[0]);
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}
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void be_nontextured() { nontextured->enable(); }
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void be_textured() { textured->enable(); }
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#endif
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}
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