205 lines
3.7 KiB
C
205 lines
3.7 KiB
C
/**
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* Test very basic glsl functionality (identity vertex and fragment shaders).
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* Brian Paul & Stephane Marchesin
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*/
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#include <assert.h>
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <math.h>
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#include <GL/glew.h>
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#include <GL/glut.h>
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#include "shaderutil.h"
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static char *FragProgFile = NULL;
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static char *VertProgFile = NULL;
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static GLuint fragShader;
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static GLuint vertShader;
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static GLuint program;
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static GLint win = 0;
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static GLboolean anim = GL_FALSE;
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static GLfloat xRot = 0.0f, yRot = 0.0f;
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static int w,h;
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static void
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Redisplay(void)
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{
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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glBegin(GL_TRIANGLES);
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glColor3f(.8,0,0);
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glVertex3f(-0.9, -0.9, 0.0);
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glColor3f(0,.9,0);
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glVertex3f( 0.9, -0.9, 0.0);
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glColor3f(0,0,.7);
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glVertex3f( 0.0, 0.9, 0.0);
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glEnd();
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glutSwapBuffers();
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}
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static void
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Idle(void)
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{
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yRot = glutGet(GLUT_ELAPSED_TIME) * 0.1;
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glutPostRedisplay();
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}
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static void
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Reshape(int width, int height)
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{
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glViewport(0, 0, width, height);
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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w = width;
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h = height;
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}
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static void
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CleanUp(void)
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{
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glDeleteShader(fragShader);
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glDeleteShader(vertShader);
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glDeleteProgram(program);
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glutDestroyWindow(win);
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}
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static void
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Key(unsigned char key, int x, int y)
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{
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(void) x;
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(void) y;
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switch(key) {
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case ' ':
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case 'a':
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anim = !anim;
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if (anim)
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glutIdleFunc(Idle);
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else
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glutIdleFunc(NULL);
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break;
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case 27:
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CleanUp();
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exit(0);
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break;
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}
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glutPostRedisplay();
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}
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static void
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SpecialKey(int key, int x, int y)
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{
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const GLfloat step = 3.0f;
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(void) x;
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(void) y;
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switch(key) {
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case GLUT_KEY_UP:
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xRot -= step;
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break;
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case GLUT_KEY_DOWN:
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xRot += step;
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break;
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case GLUT_KEY_LEFT:
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yRot -= step;
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break;
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case GLUT_KEY_RIGHT:
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yRot += step;
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break;
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}
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glutPostRedisplay();
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}
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static void
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Init(void)
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{
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static const char *fragShaderText =
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"void main() {\n"
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" gl_FragColor = vec4(1.0,0.0,0.0,1.0);\n"
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"}\n";
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static const char *vertShaderText =
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"void main() {\n"
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" gl_Position = gl_Vertex;\n"
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"}\n";
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if (!ShadersSupported())
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exit(1);
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if (FragProgFile)
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fragShader = CompileShaderFile(GL_FRAGMENT_SHADER, FragProgFile);
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else
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fragShader = CompileShaderText(GL_FRAGMENT_SHADER, fragShaderText);
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if (VertProgFile)
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vertShader = CompileShaderFile(GL_VERTEX_SHADER, VertProgFile);
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else
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vertShader = CompileShaderText(GL_VERTEX_SHADER, vertShaderText);
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program = LinkShaders(vertShader, fragShader);
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glUseProgram(program);
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/*assert(glGetError() == 0);*/
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glClearColor(0.3f, 0.3f, 0.3f, 0.0f);
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glEnable(GL_DEPTH_TEST);
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printf("GL_RENDERER = %s\n",(const char *) glGetString(GL_RENDERER));
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assert(glIsProgram(program));
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assert(glIsShader(fragShader));
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assert(glIsShader(vertShader));
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glColor3f(1, 0, 0);
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}
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static void
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ParseOptions(int argc, char *argv[])
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{
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int i;
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for (i = 1; i < argc; i++) {
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if (strcmp(argv[i], "-fs") == 0) {
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FragProgFile = argv[i+1];
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}
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else if (strcmp(argv[i], "-vs") == 0) {
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VertProgFile = argv[i+1];
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}
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}
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}
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int
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main(int argc, char *argv[])
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{
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glutInit(&argc, argv);
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glutInitWindowSize(200, 200);
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glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
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win = glutCreateWindow(argv[0]);
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glewInit();
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glutReshapeFunc(Reshape);
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glutKeyboardFunc(Key);
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glutSpecialFunc(SpecialKey);
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glutDisplayFunc(Redisplay);
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if (anim)
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glutIdleFunc(Idle);
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ParseOptions(argc, argv);
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Init();
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glutMainLoop();
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return 0;
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}
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