Attachment 34945 Details for Bug 27590 – Simple program which demonstrates the issue.

Simple program which demonstrates the issue.

fbofail.c (text/plain), 3.22 KB, created by Nick Bowler on 2010-04-12 18:46:39 UTC

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Filename:

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Creator: Nick Bowler

Created: 2010-04-12 18:46:39 UTC

Size: 3.22 KB

patch

obsolete

>/*
> * Copyright (C) 2010 Nick Bowler
> *
> * License WTFPL2: Do What The Fuck You Want To Public License, version 2.
> * This is free software: you are free to do what the fuck you want to.
> * There is NO WARRANTY, to the extent permitted by law.
> *
> * In case the above is not acceptable, you may alternately choose the terms
> * of the MIT license: http://opensource.org/licenses/mit-license.php.
> */
>#include <stdio.h>
>#include <stdlib.h>
>#include <math.h>
>
>#include <GL/glew.h>
>#include <GL/glut.h>
>
>#ifndef XRES
>#	define XRES 32
>#endif
>#ifndef YRES
>#	define YRES 32
>#endif
>
>static float pixbuf[YRES][XRES];
>
>void display(void)
>{
>	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
>
>	for (unsigned i = 0; i < YRES; i++) {
>		for (unsigned j = 0; j < XRES; j++) {
>			if (isfinite(pixbuf[i][j])) {
>				glPointSize(pixbuf[i][j]);
>				glBegin(GL_POINTS);
>				glVertex2d(j, i);
>				glEnd();
>			}
>		}
>	}
>
>	glutSwapBuffers();
>}
>
>void reshape(int width, int height)
>{
>	glMatrixMode(GL_PROJECTION);
>	glLoadIdentity();
>	glViewport(0, 0, width, height);
>	glOrtho(0, XRES, 0, YRES, -1, 1);
>	glMatrixMode(GL_MODELVIEW);
>}
>
>void drawTeapot(size_t w, size_t h)
>{
>	glPushAttrib(GL_VIEWPORT_BIT | GL_COLOR_BUFFER_BIT | GL_TRANSFORM_BIT);
>	glViewport(0, 0, w, h);
>
>	glClearColor(0, 0, 0, 0);
>
>	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
>
>	glMatrixMode(GL_PROJECTION);
>	glPushMatrix();
>	glLoadIdentity();
>	gluPerspective(40.0, 1, 0.1, 10.0);
>
>	glMatrixMode(GL_MODELVIEW);
>	glPushMatrix();
>	glLoadIdentity();
>	glTranslated(0, 0, -5);
>
>	glColor3d(1, 1, 1);
>	glutSolidTeapot(1);
>
>	glPopMatrix();
>	glMatrixMode(GL_PROJECTION);
>	glPopMatrix();
>
>	glPopAttrib();
>}
>
>void rasterTeapot(float *pixels, size_t w, size_t h)
>{
>	GLuint fbo, buffers[2];
>
>	glGenFramebuffersEXT(1, &fbo);
>	glGenRenderbuffersEXT(2, buffers);
>
>	glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, buffers[0]);
>	glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_RGB8, w, h);
>
>	glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, buffers[1]);
>	glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_DEPTH_COMPONENT, w, h);
>
>	glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fbo);
>	glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT,
>		GL_COLOR_ATTACHMENT0_EXT, GL_RENDERBUFFER_EXT, buffers[0]);
>	glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT,
>		GL_DEPTH_ATTACHMENT_EXT, GL_RENDERBUFFER_EXT, buffers[1]);
>
>	drawTeapot(w, h);
>
>	glPixelTransferf(GL_DEPTH_SCALE, -1);
>	glPixelTransferf(GL_DEPTH_BIAS,   1);
>
>	glReadPixels(0, 0, w, h, GL_DEPTH_COMPONENT, GL_FLOAT, pixels);
>	for (unsigned i = 0; i < w*h; i++) {
>		if (pixels[i] == 0)
>			pixels[i] = -INFINITY;
>		pixels[i] *= 1200;
>		pixels[i] -= 11;
>	}
>
>	glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
>	glDeleteFramebuffersEXT(1, &fbo);
>	glDeleteRenderbuffersEXT(2, buffers);
>}
>
>int main(int argc, char **argv)
>{
>	GLenum err;
>	int window;
>
>	glutInit(&argc, argv);
>	glutInitDisplayMode(GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE);
>
>	window = glutCreateWindow("GLTest");
>	if (window == 0)
>		return EXIT_FAILURE;
>	glutSetWindow(window);
>
>	err = glewInit();
>	if (err != GLEW_OK) {
>		fprintf(stderr, "glewInit: %s\n", glewGetErrorString(err));
>		return EXIT_FAILURE;
>	}
>
>	glEnable(GL_DEPTH_TEST);
>	glEnable(GL_POINT_SMOOTH);
>	rasterTeapot(pixbuf[0], XRES, YRES);
>
>	glutDisplayFunc(display);
>	glutReshapeFunc(reshape);
>	glutMainLoop();
>	return 0;
>}

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Attachments on bug 27590: 34897 | 34945

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