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progs/trivial: make clear-fbo-scissor.c work with other GL drivers 

NVIDIA's driver requires that the texture that we're going to render into
be complete.  Need to set min/mag filters to non-mipmap modes.

Plus added other error/debug checks.
This commit is contained in:
Brian Paul 2010-03-10 14:32:56 -07:00
parent 3198cd4a65
commit d5ccbea63c
1 changed files with 19 additions and 1 deletions
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20
progs/trivial/clear-fbo-scissor.c
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@ -11,6 +11,7 @@
#include <string.h>
#include <GL/glew.h>
#include <GL/glut.h>
#include <GL/glu.h>
static int Width = 512, Height = 512;
@ -18,12 +19,20 @@ static GLuint MyFB, MyRB;
static GLboolean UseTex = GL_FALSE;
#define CheckError() assert(glGetError() == 0)
#define CheckError() \
do { \
GLenum err = glGetError(); \
if (err != GL_NO_ERROR) \
printf("Error: %s\n", gluErrorString(err)); \
assert(err == GL_NO_ERROR); \
} while (0)
static void
Init(void)
{
GLenum status;
fprintf(stderr, "GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
fprintf(stderr, "GL_VERSION = %s\n", (char *) glGetString(GL_VERSION));
fprintf(stderr, "GL_VENDOR = %s\n", (char *) glGetString(GL_VENDOR));
@ -45,6 +54,8 @@ Init(void)
glBindTexture(GL_TEXTURE_2D, tex);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, Width, Height, 0,
GL_RGBA, GL_UNSIGNED_BYTE, NULL);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT,
GL_COLOR_ATTACHMENT0_EXT,
GL_TEXTURE_2D, tex, 0);
@ -59,6 +70,11 @@ Init(void)
glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_RGB, Width, Height);
}
status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
if (status != GL_FRAMEBUFFER_COMPLETE_EXT) {
fprintf(stderr, "Framebuffer object is incomplete (0x%x)!\n", status);
}
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
}
@ -134,6 +150,8 @@ Draw(void)
glClear(GL_COLOR_BUFFER_BIT);
}
CheckError();
/* gray triangle in middle, pointing up */
glColor3f(0.5, 0.5, 0.5);
glBegin(GL_TRIANGLES);