+++ /dev/null
-/*
- * Test GL_ARB_draw_buffers2, GL_ARB_draw_buffers, GL_EXT_framebuffer_object
- * and GLSL's gl_FragData[].
- *
- * We draw to two color buffers and show the left half of the first
- * color buffer on the left side of the window, and show the right
- * half of the second color buffer on the right side of the window.
- *
- * Different color masks are used for the two color buffers.
- * Blending is enabled for the second buffer only.
- *
- * Brian Paul
- * 31 Dec 2009
- */
-
-
-#include <assert.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <math.h>
-#include <GL/glew.h>
-#include <GL/glut.h>
-#include "extfuncs.h"
-
-static int Win;
-static int Width = 400, Height = 400;
-static GLuint FBobject, RBobjects[3];
-static GLfloat Xrot = 0.0, Yrot = 0.0;
-static GLuint Program;
-static GLboolean Anim = GL_TRUE;
-
-
-static void
-CheckError(int line)
-{
- GLenum err = glGetError();
- if (err) {
- printf("GL Error 0x%x at line %d\n", (int) err, line);
- }
-}
-
-
-static void
-Display(void)
-{
- GLubyte *buffer = malloc(Width * Height * 4);
- static const GLenum buffers[2] = {
- GL_COLOR_ATTACHMENT0_EXT,
- GL_COLOR_ATTACHMENT1_EXT
- };
-
- glUseProgram_func(Program);
-
- glEnable(GL_DEPTH_TEST);
-
- /* draw to user framebuffer */
- glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, FBobject);
-
- /* Clear color buffer 0 (blue) */
- glDrawBuffer(GL_COLOR_ATTACHMENT0_EXT);
- glClear(GL_COLOR_BUFFER_BIT);
-
- /* Clear color buffer 1 (1 - blue) */
- glDrawBuffer(GL_COLOR_ATTACHMENT1_EXT);
- glClear(GL_COLOR_BUFFER_BIT);
-
- glClear(GL_DEPTH_BUFFER_BIT);
-
- /* draw to two buffers w/ fragment shader */
- glDrawBuffersARB(2, buffers);
-
- /* different color masks for each buffer */
- if (1) {
- glColorMaskIndexedEXT(0, GL_TRUE, GL_FALSE, GL_FALSE, GL_FALSE);
- glColorMaskIndexedEXT(1, GL_FALSE, GL_TRUE, GL_FALSE, GL_FALSE);
- }
-
- glPushMatrix();
- glRotatef(Xrot, 1, 0, 0);
- glRotatef(Yrot, 0, 1, 0);
- glPushMatrix();
- glTranslatef(1, 0, 0);
- glutSolidTorus(1.0, 2.0, 10, 20);
- glPopMatrix();
- glPushMatrix();
- glTranslatef(-1, 0, 0);
- glRotatef(90, 1, 0, 0);
- glutSolidTorus(1.0, 2.0, 10, 20);
- glPopMatrix();
- glPopMatrix();
-
- /* restore default color masks */
- glColorMaskIndexedEXT(0, GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
- glColorMaskIndexedEXT(1, GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
-
- /* read from user framebuffer */
- /* left half = colorbuffer 0 */
- glReadBuffer(GL_COLOR_ATTACHMENT0_EXT);
- glPixelStorei(GL_PACK_ROW_LENGTH, Width);
- glPixelStorei(GL_PACK_SKIP_PIXELS, 0);
- glReadPixels(0, 0, Width / 2, Height, GL_RGBA, GL_UNSIGNED_BYTE,
- buffer);
-
- /* right half = colorbuffer 1 */
- glReadBuffer(GL_COLOR_ATTACHMENT1_EXT);
- glPixelStorei(GL_PACK_SKIP_PIXELS, Width / 2);
- glReadPixels(Width / 2, 0, Width - Width / 2, Height,
- GL_RGBA, GL_UNSIGNED_BYTE,
- buffer);
-
- /* draw to window */
- glUseProgram_func(0);
- glDisable(GL_DEPTH_TEST);
- glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
- glWindowPos2iARB(0, 0);
- glDrawPixels(Width, Height, GL_RGBA, GL_UNSIGNED_BYTE, buffer);
-
- free(buffer);
- glutSwapBuffers();
- CheckError(__LINE__);
-}
-
-
-static void
-Idle(void)
-{
- Xrot = glutGet(GLUT_ELAPSED_TIME) * 0.05;
- glutPostRedisplay();
-}
-
-
-static void
-Reshape(int width, int height)
-{
- float ar = (float) width / (float) height;
-
- glViewport(0, 0, width, height);
- glMatrixMode(GL_PROJECTION);
- glLoadIdentity();
- glFrustum(-ar, ar, -1.0, 1.0, 5.0, 35.0);
- glMatrixMode(GL_MODELVIEW);
- glLoadIdentity();
- glTranslatef(0.0, 0.0, -20.0);
-
- Width = width;
- Height = height;
-
- glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, RBobjects[0]);
- glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_RGB, Width, Height);
- glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, RBobjects[1]);
- glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_RGB, Width, Height);
- glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, RBobjects[2]);
- glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_DEPTH_COMPONENT,
- Width, Height);
-}
-
-
-static void
-CleanUp(void)
-{
- glDeleteFramebuffersEXT(1, &FBobject);
- glDeleteRenderbuffersEXT(3, RBobjects);
- glutDestroyWindow(Win);
- exit(0);
-}
-
-
-static void
-Key(unsigned char key, int x, int y)
-{
- (void) x;
- (void) y;
- switch (key) {
- case ' ':
- Anim = !Anim;
- glutIdleFunc(Anim ? Idle : NULL);
- break;
- case 'x':
- Xrot += 5.0;
- break;
- case 'X':
- Xrot -= 5.0;
- break;
- case 'y':
- Yrot += 5.0;
- break;
- case 'Y':
- Yrot -= 5.0;
- break;
- case 27:
- CleanUp();
- break;
- }
- glutPostRedisplay();
-}
-
-
-static void
-CheckExtensions(void)
-{
- const char *req[] = {
- "GL_EXT_framebuffer_object",
- "GL_ARB_draw_buffers",
- "GL_EXT_draw_buffers2"
- };
-
- const char *version = (const char *) glGetString(GL_VERSION);
- GLint numBuf;
- GLint i;
-
- for (i = 0; i < 3; i++) {
- if (!glutExtensionSupported(req[i])) {
- printf("Sorry, %s extension is required!\n", req[i]);
- exit(1);
- }
- }
- if (version[0] != '2') {
- printf("Sorry, OpenGL 2.0 is required!\n");
- exit(1);
- }
-
- glGetIntegerv(GL_MAX_DRAW_BUFFERS_ARB, &numBuf);
- printf("GL_MAX_DRAW_BUFFERS_ARB = %d\n", numBuf);
- if (numBuf < 2) {
- printf("Sorry, GL_MAX_DRAW_BUFFERS_ARB needs to be >= 2\n");
- exit(1);
- }
-
- printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
-}
-
-
-static void
-SetupRenderbuffers(void)
-{
- glGenFramebuffersEXT(1, &FBobject);
- glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, FBobject);
-
- glGenRenderbuffersEXT(3, RBobjects);
-
- glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, RBobjects[0]);
- glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_RGB, Width, Height);
-
- glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, RBobjects[1]);
- glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_RGB, Width, Height);
-
- glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, RBobjects[2]);
- glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_DEPTH_COMPONENT,
- Width, Height);
-
- glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
- GL_RENDERBUFFER_EXT, RBobjects[0]);
- glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT1_EXT,
- GL_RENDERBUFFER_EXT, RBobjects[1]);
- glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT,
- GL_RENDERBUFFER_EXT, RBobjects[2]);
-
- CheckError(__LINE__);
-}
-
-
-static GLuint
-LoadAndCompileShader(GLenum target, const char *text)
-{
- GLint stat;
- GLuint shader = glCreateShader_func(target);
- glShaderSource_func(shader, 1, (const GLchar **) &text, NULL);
- glCompileShader_func(shader);
- glGetShaderiv_func(shader, GL_COMPILE_STATUS, &stat);
- if (!stat) {
- GLchar log[1000];
- GLsizei len;
- glGetShaderInfoLog_func(shader, 1000, &len, log);
- fprintf(stderr, "drawbuffers: problem compiling shader:\n%s\n", log);
- exit(1);
- }
- return shader;
-}
-
-
-static void
-CheckLink(GLuint prog)
-{
- GLint stat;
- glGetProgramiv_func(prog, GL_LINK_STATUS, &stat);
- if (!stat) {
- GLchar log[1000];
- GLsizei len;
- glGetProgramInfoLog_func(prog, 1000, &len, log);
- fprintf(stderr, "drawbuffers: shader link error:\n%s\n", log);
- }
-}
-
-
-static void
-SetupShaders(void)
-{
- /* emit same color to both draw buffers */
- static const char *fragShaderText =
- "void main() {\n"
- " gl_FragData[0] = gl_Color; \n"
- " gl_FragData[1] = gl_Color; \n"
- "}\n";
-
- GLuint fragShader;
-
- fragShader = LoadAndCompileShader(GL_FRAGMENT_SHADER, fragShaderText);
- Program = glCreateProgram_func();
-
- glAttachShader_func(Program, fragShader);
- glLinkProgram_func(Program);
- CheckLink(Program);
- glUseProgram_func(Program);
-}
-
-
-static void
-SetupLighting(void)
-{
- static const GLfloat ambient[4] = { 0.0, 0.0, 0.0, 0.0 };
- static const GLfloat diffuse[4] = { 1.0, 1.0, 1.0, 0.75 };
-
- glLightModelfv(GL_LIGHT_MODEL_AMBIENT, ambient);
- glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT, ambient);
- glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, diffuse);
-
- glLightModeli(GL_LIGHT_MODEL_TWO_SIDE, 0);
- glEnable(GL_LIGHT0);
- glEnable(GL_LIGHTING);
-}
-
-
-static void
-Init(void)
-{
- CheckExtensions();
- GetExtensionFuncs();
- SetupRenderbuffers();
- SetupShaders();
- SetupLighting();
- glEnable(GL_DEPTH_TEST);
-
- glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
- glEnableIndexedEXT(GL_BLEND, 1);
-}
-
-
-int
-main(int argc, char *argv[])
-{
- glutInit(&argc, argv);
- glutInitWindowPosition(0, 0);
- glutInitWindowSize(Width, Height);
- glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE);
- Win = glutCreateWindow(argv[0]);
- glewInit();
- glutIdleFunc(Anim ? Idle : NULL);
- glutReshapeFunc(Reshape);
- glutKeyboardFunc(Key);
- glutDisplayFunc(Display);
- Init();
- glutMainLoop();
- return 0;
-}
projects / mesa.git / blobdiff