lots of debug options, some code movement, etc
This commit is contained in:
Brian Paul
parent
590cd26006
commit
6494541eaa
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@ -17,15 +17,26 @@
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#include <string.h>
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#include <math.h>
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/* For debug */
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#define DEPTH 1
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#define STENCIL 1
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#define DRAW 1
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static int Width = 400, Height = 400;
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static GLenum TexTarget = GL_TEXTURE_2D; /*GL_TEXTURE_RECTANGLE_ARB;*/
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static int TexWidth = 512, TexHeight = 512;
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/*static int TexWidth = 600, TexHeight = 600;*/
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static GLuint MyFB;
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static GLuint TexObj;
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static GLuint DepthRB, StencilRB;
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static GLboolean Anim = GL_FALSE;
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static GLfloat Rot = 0.0;
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static GLboolean UsePackedDepthStencil = GL_FALSE;
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static GLuint TextureLevel = 1; /* 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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@ -41,7 +52,7 @@ CheckError(int line)
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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) * 0.05;
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Rot = glutGet(GLUT_ELAPSED_TIME) * 0.1;
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glutPostRedisplay();
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}
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@ -49,7 +60,6 @@ Idle(void)
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static void
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RenderTexture(void)
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{
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GLint level = 0;
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GLenum status;
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glMatrixMode(GL_PROJECTION);
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@ -60,10 +70,7 @@ RenderTexture(void)
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glTranslatef(0.0, 0.0, -15.0);
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/* draw to texture image */
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glBindTexture(GL_TEXTURE_2D, 0);
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glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, MyFB);
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glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
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GL_TEXTURE_2D, TexObj, level);
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status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
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if (status != GL_FRAMEBUFFER_COMPLETE_EXT) {
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@ -76,13 +83,19 @@ RenderTexture(void)
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
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CheckError(__LINE__);
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#if DEPTH
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glEnable(GL_DEPTH_TEST);
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#endif
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#if STENCIL
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glEnable(GL_STENCIL_TEST);
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glStencilFunc(GL_NEVER, 1, ~0);
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glStencilOp(GL_REPLACE, GL_KEEP, GL_REPLACE);
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#endif
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CheckError(__LINE__);
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#if DEPTH || STENCIL
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/* draw diamond-shaped stencil pattern */
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glColor3f(0, 1, 0);
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glBegin(GL_POLYGON);
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@ -91,10 +104,13 @@ RenderTexture(void)
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glVertex2f( 0.2, 0.0);
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glVertex2f( 0.0, 0.2);
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glEnd();
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#endif
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/* draw teapot where stencil != 1 */
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#if STENCIL
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glStencilFunc(GL_NOTEQUAL, 1, ~0);
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glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
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#endif
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CheckError(__LINE__);
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@ -115,12 +131,18 @@ RenderTexture(void)
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glutSolidTeapot(0.5);
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glPopMatrix();
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glDisable(GL_LIGHTING);
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/*
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PrintStencilHistogram(TexWidth, TexHeight);
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*/
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#endif
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glDisable(GL_DEPTH_TEST);
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glDisable(GL_STENCIL_TEST);
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#if DRAW
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/* Bind normal framebuffer */
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glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
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#endif
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CheckError(__LINE__);
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}
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@ -135,7 +157,7 @@ Display(void)
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RenderTexture();
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/* draw textured quad in the window */
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#if DRAW
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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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@ -150,23 +172,38 @@ Display(void)
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glPushMatrix();
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glRotatef(Rot, 0, 1, 0);
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glEnable(GL_TEXTURE_2D);
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glBindTexture(GL_TEXTURE_2D, TexObj);
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glEnable(TexTarget);
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glBindTexture(TexTarget, TexObj);
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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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if (TexTarget == GL_TEXTURE_2D) {
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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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}
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else {
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assert(TexTarget == GL_TEXTURE_RECTANGLE_ARB);
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glTexCoord2f(0, 0);
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glVertex2f(-1, -1);
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glTexCoord2f(TexWidth, 0);
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glVertex2f(1, -1);
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glColor3f(1.0, 1.0, 1.0);
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glTexCoord2f(TexWidth, TexHeight);
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glVertex2f(1, 1);
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glTexCoord2f(0, TexHeight);
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glVertex2f(-1, 1);
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}
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glEnd();
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glPopMatrix();
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glDisable(GL_TEXTURE_2D);
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glDisable(TexTarget);
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#endif
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glutSwapBuffers();
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CheckError(__LINE__);
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}
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@ -184,9 +221,13 @@ Reshape(int width, int height)
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static void
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CleanUp(void)
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{
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#if DEPTH
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glDeleteRenderbuffersEXT(1, &DepthRB);
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#endif
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#if STENCIL
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if (!UsePackedDepthStencil)
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glDeleteRenderbuffersEXT(1, &StencilRB);
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#endif
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glDeleteFramebuffersEXT(1, &MyFB);
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glDeleteTextures(1, &TexObj);
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@ -222,6 +263,7 @@ Key(unsigned char key, int x, int y)
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static void
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Init(int argc, char *argv[])
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{
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static const GLfloat mat[4] = { 1.0, 0.5, 0.5, 1.0 };
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GLint i;
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if (!glutExtensionSupported("GL_EXT_framebuffer_object")) {
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@ -253,6 +295,31 @@ Init(int argc, char *argv[])
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glGetIntegerv(GL_FRAMEBUFFER_BINDING_EXT, &i);
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assert(i == MyFB);
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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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/* make two image levels */
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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, 1, TexIntFormat, TexWidth/2, TexHeight/2, 0,
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GL_RGBA, GL_UNSIGNED_BYTE, NULL);
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TexWidth = TexWidth >> TextureLevel;
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TexHeight = TexHeight >> TextureLevel;
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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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glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
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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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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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#if DEPTH
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/* make depth renderbuffer */
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glGenRenderbuffersEXT(1, &DepthRB);
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assert(DepthRB);
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@ -275,9 +342,11 @@ Init(int argc, char *argv[])
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/* attach DepthRB to MyFB */
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glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT,
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GL_RENDERBUFFER_EXT, DepthRB);
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#endif
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CheckError(__LINE__);
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#if STENCIL
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if (UsePackedDepthStencil) {
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/* DepthRb is a combined depth/stencil renderbuffer */
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glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT,
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@ -303,23 +372,16 @@ Init(int argc, char *argv[])
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CheckError(__LINE__);
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printf("Stencil renderbuffer size = %d bits\n", i);
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assert(i > 0);
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#endif
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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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CheckError(__LINE__);
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/* Make texture object/image */
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glGenTextures(1, &TexObj);
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glBindTexture(GL_TEXTURE_2D, TexObj);
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, TexWidth, TexHeight, 0,
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GL_RGBA, GL_UNSIGNED_BYTE, NULL);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
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CheckError(__LINE__);
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/* lighting */
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glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, mat);
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}
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