progs/trivial: Add tri-fbo-tex-mip
Tests rendering to mip levels other then first
This commit is contained in:
Jakob Bornecrantz
1
progs/trivial/.gitignore
vendored
1
progs/trivial/.gitignore
vendored
@@ -85,6 +85,7 @@ tri-dlist
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tri-edgeflag
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tri-fbo
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tri-fbo-tex
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tri-fbo-tex-mip
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tri-flat
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tri-flat-clip
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tri-fog
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@@ -94,6 +94,7 @@ SOURCES = \
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tri-logicop-xor.c \
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tri-dlist.c \
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tri-edgeflag.c \
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tri-fbo-tex-mip.c \
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tri-fbo-tex.c \
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tri-fbo.c \
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tri-flat-clip.c \
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@@ -88,6 +88,7 @@ progs = [
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'tri-cull',
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'tri-dlist',
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'tri-edgeflag',
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'tri-fbo-tex-mip',
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'tri-fbo-tex',
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'tri-fbo',
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'tri-flat-clip',
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269
progs/trivial/tri-fbo-tex-mip.c
Normal file
269
progs/trivial/tri-fbo-tex-mip.c
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@@ -0,0 +1,269 @@
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/*
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* Test GL_EXT_framebuffer_object render-to-texture
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*
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* Draw a teapot into a texture image with stenciling.
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* Then draw a textured quad using that texture.
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*
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* Brian Paul
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* 18 Apr 2005
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*/
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#include <GL/glew.h>
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#include <GL/glut.h>
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#include <assert.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <math.h>
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/* For debug */
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static int Win = 0;
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static int Width = 512, Height = 512;
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static GLenum TexTarget = GL_TEXTURE_2D;
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static int TexWidth = 512, TexHeight = 512;
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static GLuint MyFB;
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static GLuint TexObj;
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static GLboolean Anim = GL_FALSE;
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static GLfloat Rot = 0.0;
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static GLuint TextureLevel = 4; /* which texture level to render to */
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static GLenum TexIntFormat = GL_RGB; /* either GL_RGB or GL_RGBA */
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static void
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CheckError(int line)
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{
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GLenum err = glGetError();
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if (err) {
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printf("GL Error 0x%x at line %d\n", (int) err, line);
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}
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}
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static void
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Idle(void)
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{
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Rot = 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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RenderTexture(void)
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{
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GLenum status;
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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glOrtho(-1.0, 1.0, -1.0, 1.0, 5.0, 25.0);
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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glTranslatef(0.0, 0.0, -15.0);
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if (1) {
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/* draw to texture image */
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glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, MyFB);
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status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
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if (status != GL_FRAMEBUFFER_COMPLETE_EXT) {
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printf("Framebuffer incomplete!!!\n");
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}
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glViewport(0, 0,
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TexWidth / (1 << TextureLevel),
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TexHeight / (1 << TextureLevel));
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glClearColor(0.5, 0.5, 1.0, 0.0);
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glClear(GL_COLOR_BUFFER_BIT);
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CheckError(__LINE__);
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glBegin(GL_POLYGON);
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glColor3f(1, 0, 0);
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glVertex2f(-1, -1);
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glColor3f(0, 1, 0);
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glVertex2f(1, -1);
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glColor3f(0, 0, 1);
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glVertex2f(0, 1);
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glEnd();
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/* Bind normal framebuffer */
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glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
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}
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else {
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}
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CheckError(__LINE__);
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}
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static void
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Display(void)
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{
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float ar = (float) Width / (float) Height;
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RenderTexture();
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/* draw textured quad in the window */
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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glFrustum(-ar, ar, -1.0, 1.0, 5.0, 25.0);
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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glTranslatef(0.0, 0.0, -7.0);
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glViewport(0, 0, Width, Height);
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glClearColor(0.25, 0.25, 0.25, 0);
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glClear(GL_COLOR_BUFFER_BIT);
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glPushMatrix();
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glRotatef(Rot, 0, 1, 0);
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glEnable(TexTarget);
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glBindTexture(TexTarget, TexObj);
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{
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glBegin(GL_POLYGON);
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glColor3f(0.25, 0.25, 0.25);
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glTexCoord2f(0, 0);
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glVertex2f(-1, -1);
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glTexCoord2f(1, 0);
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glVertex2f(1, -1);
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glColor3f(1.0, 1.0, 1.0);
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glTexCoord2f(1, 1);
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glVertex2f(1, 1);
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glTexCoord2f(0, 1);
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glVertex2f(-1, 1);
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glEnd();
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}
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glPopMatrix();
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glDisable(TexTarget);
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glutSwapBuffers();
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CheckError(__LINE__);
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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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Width = width;
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Height = 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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glDeleteFramebuffersEXT(1, &MyFB);
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glDeleteTextures(1, &TexObj);
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glutDestroyWindow(Win);
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exit(0);
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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 '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 's':
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Rot += 2.0;
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break;
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case 27:
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CleanUp();
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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(int argc, char *argv[])
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{
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if (!glutExtensionSupported("GL_EXT_framebuffer_object")) {
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printf("GL_EXT_framebuffer_object not found!\n");
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exit(0);
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}
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printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
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/* Make texture object/image */
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glGenTextures(1, &TexObj);
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glBindTexture(TexTarget, TexObj);
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glTexParameteri(TexTarget, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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glTexParameteri(TexTarget, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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glTexParameteri(TexTarget, GL_TEXTURE_BASE_LEVEL, TextureLevel);
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glTexParameteri(TexTarget, GL_TEXTURE_MAX_LEVEL, TextureLevel);
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glTexImage2D(TexTarget, 0, TexIntFormat, TexWidth, TexHeight, 0,
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GL_RGBA, GL_UNSIGNED_BYTE, NULL);
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glTexImage2D(TexTarget, TextureLevel, TexIntFormat,
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TexWidth / (1 << TextureLevel), TexHeight / (1 << TextureLevel), 0,
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GL_RGBA, GL_UNSIGNED_BYTE, NULL);
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glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
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/* gen framebuffer id, delete it, do some assertions, just for testing */
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glGenFramebuffersEXT(1, &MyFB);
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glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, MyFB);
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assert(glIsFramebufferEXT(MyFB));
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CheckError(__LINE__);
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/* Render color to texture */
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glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
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TexTarget, TexObj, TextureLevel);
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CheckError(__LINE__);
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/* bind regular framebuffer */
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glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
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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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glutInitWindowPosition(0, 0);
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glutInitWindowSize(Width, Height);
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glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE);
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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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glutDisplayFunc(Display);
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if (Anim)
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glutIdleFunc(Idle);
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Init(argc, argv);
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glutMainLoop();
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return 0;
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}
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