StackOverflow2013

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18930882
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2013-09-21T09:08:27.343
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<p>Now it works</p> <pre><code>glewExperimental=true; GLenum err=glewInit(); if(err!=GLEW_OK) { //Problem: glewInit failed, something is seriously wrong. fprintf(stderr, "glewInit failed, aborting.\n"); } #include "GL/glew.h" #include "GL/glext.h" #include "GL/glu.h" #include "GL/freeglut.h" #include <cstdio> uint16_t tex_width = 75; uint16_t tex_height = 24; GLuint texture; void display(void) { glBindFramebuffer(GL_FRAMEBUFFER, 0); glViewport(0, 0, glutGet(GLUT_WINDOW_WIDTH), glutGet(GLUT_WINDOW_HEIGHT)); glClearColor(0.0, 0.0, 0.0, 1.0); glClear(GL_COLOR_BUFFER_BIT/* | GL_DEPTH_BUFFER_BIT*/); glMatrixMode(GL_PROJECTION); glPushMatrix(); glLoadIdentity(); glOrtho(0.0, glutGet(GLUT_WINDOW_WIDTH), 0.0, glutGet(GLUT_WINDOW_HEIGHT), -1.0, 1.0); glMatrixMode(GL_MODELVIEW); glPushMatrix(); glLoadIdentity(); glEnable(GL_TEXTURE_2D); glActiveTexture(GL_TEXTURE0); glBindTexture(GL_TEXTURE_2D, texture); // Draw a textured quad glBegin(GL_TRIANGLE_STRIP); glTexCoord2f(0, 0); glVertex3f(0, 0, 0); glTexCoord2f(0, 1); glVertex3f(0, tex_width, 0); glTexCoord2f(1, 1); glVertex3f(tex_height, tex_width, 0); glTexCoord2f(1, 0); glVertex3f(tex_height, 0, 0); glEnd(); glDisable(GL_TEXTURE_2D); glPopMatrix(); glMatrixMode(GL_PROJECTION); glPopMatrix(); glMatrixMode(GL_MODELVIEW); glutSwapBuffers(); } void render_texture() { GLuint framebuffer = 0; glGenFramebuffers(1, &framebuffer); glBindFramebuffer(GL_FRAMEBUFFER, framebuffer); glGenTextures(1, &texture); glBindTexture(GL_TEXTURE_2D, texture); glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, tex_width, tex_height, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture, 0); GLenum draw_buffers[1] = {GL_COLOR_ATTACHMENT0}; glDrawBuffers(1, draw_buffers); if(glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) { fprintf(stderr, "[render_texture] Fehler im Framebuffer\n"); exit(1); } glBindFramebuffer(GL_FRAMEBUFFER, framebuffer); glViewport(0, 0, tex_width, tex_height); glColor4f(1.0f, 0.0f, 1.0f, 0.5f); glBegin(GL_POLYGON); glVertex2f(0.f,0.f); glVertex2f(tex_width, 0.0f); glVertex2f(tex_width, (GLfloat)tex_height/2.f); glVertex2f(tex_width-(GLfloat)tex_height/2.f, tex_height); glVertex2f(0, tex_height); glEnd(); } int main(int argc, char **argv) { glutInit(&argc, argv); glutInitContextVersion(3, 1); glutInitContextProfile(GLUT_CORE_PROFILE); glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE/* | GLUT_DEPTH*/); glutInitWindowSize(1024, 1024); glutCreateWindow("texture test"); glutDisplayFunc(display); glewExperimental=true; GLenum err=glewInit(); if(err!=GLEW_OK) { //Problem: glewInit failed, something is seriously wrong. fprintf(stderr, "glewInit failed, aborting.\n"); } render_texture(); glutMainLoop(); } </code></pre>
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1. This table or related slice is empty.
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1. POopengl program crashes on glBegin(GL_QUADS)
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1. PTAnswer
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1. This table or related slice is empty.
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1. USuser2798943
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