From: Brian Paul Date: Sat, 18 Apr 2009 19:00:48 +0000 (-0600) Subject: demos: move tests/fbotexture.c to demos/ X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=292e1920930dad242b1130cb2b7b4ced2a3024f8;p=mesa.git demos: move tests/fbotexture.c to demos/ --- diff --git a/progs/demos/Makefile b/progs/demos/Makefile index 0f72595c237..a1c99c6c545 100644 --- a/progs/demos/Makefile +++ b/progs/demos/Makefile @@ -22,6 +22,7 @@ PROGS = \ drawpix \ engine \ fbo_firecube \ + fbotexture \ fire \ fogcoord \ fplight \ diff --git a/progs/demos/fbotexture.c b/progs/demos/fbotexture.c new file mode 100644 index 00000000000..50a4b00afce --- /dev/null +++ b/progs/demos/fbotexture.c @@ -0,0 +1,621 @@ +/* + * Test GL_EXT_framebuffer_object render-to-texture + * + * Draw a teapot into a texture image with stenciling. + * Then draw a textured quad using that texture. + * + * Brian Paul + * 18 Apr 2005 + */ + + +#include +#include +#include +#include +#include +#include +#include + +/* For debug */ +#define DEPTH 1 +#define STENCIL 1 +#define DRAW 1 + + +static int Win = 0; +static int Width = 400, Height = 400; + +#if 1 +static GLenum TexTarget = GL_TEXTURE_2D; +static int TexWidth = 512, TexHeight = 512; +static GLenum TexIntFormat = GL_RGB; /* either GL_RGB or GL_RGBA */ +#else +static GLenum TexTarget = GL_TEXTURE_RECTANGLE_ARB; +static int TexWidth = 200, TexHeight = 200; +static GLenum TexIntFormat = GL_RGB5; /* either GL_RGB or GL_RGBA */ +#endif +static GLuint TextureLevel = 0; /* which texture level to render to */ + +static GLuint MyFB; +static GLuint TexObj; +static GLuint DepthRB = 0, StencilRB = 0; +static GLboolean Anim = GL_FALSE; +static GLfloat Rot = 0.0; +static GLboolean UsePackedDepthStencil = GL_FALSE; +static GLboolean UsePackedDepthStencilBoth = GL_FALSE; +static GLboolean Use_ARB_fbo = GL_FALSE; +static GLboolean Cull = GL_FALSE; +static GLboolean Wireframe = GL_FALSE; + + +static void +CheckError(int line) +{ + GLenum err = glGetError(); + if (err) { + printf("GL Error 0x%x at line %d\n", (int) err, line); + } +} + + +static void +Idle(void) +{ + Rot = glutGet(GLUT_ELAPSED_TIME) * 0.1; + glutPostRedisplay(); +} + + +static void +RenderTexture(void) +{ + GLenum status; + + glMatrixMode(GL_PROJECTION); + glLoadIdentity(); + glOrtho(-1.0, 1.0, -1.0, 1.0, 5.0, 25.0); + glMatrixMode(GL_MODELVIEW); + glLoadIdentity(); + glTranslatef(0.0, 0.0, -15.0); + + /* draw to texture image */ + glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, MyFB); + + status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT); + if (status != GL_FRAMEBUFFER_COMPLETE_EXT) { + printf("Framebuffer incomplete!!!\n"); + } + + glViewport(0, 0, TexWidth, TexHeight); + + glClearColor(0.5, 0.5, 1.0, 0.0); + glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT); + CheckError(__LINE__); + +#if DEPTH + glEnable(GL_DEPTH_TEST); +#endif + +#if STENCIL + glEnable(GL_STENCIL_TEST); + glStencilFunc(GL_NEVER, 1, ~0); + glStencilOp(GL_REPLACE, GL_KEEP, GL_REPLACE); +#endif + + CheckError(__LINE__); + +#if DEPTH || STENCIL + /* draw diamond-shaped stencil pattern */ + glColor3f(0, 1, 0); + glBegin(GL_POLYGON); + glVertex2f(-0.2, 0.0); + glVertex2f( 0.0, -0.2); + glVertex2f( 0.2, 0.0); + glVertex2f( 0.0, 0.2); + glEnd(); +#endif + + /* draw teapot where stencil != 1 */ +#if STENCIL + glStencilFunc(GL_NOTEQUAL, 1, ~0); + glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP); +#endif + + CheckError(__LINE__); + + if (Wireframe) { + glPolygonMode(GL_FRONT, GL_LINE); + } + else { + glPolygonMode(GL_FRONT, GL_FILL); + } + + if (Cull) { + /* cull back */ + glCullFace(GL_BACK); + glEnable(GL_CULL_FACE); + } + else { + glDisable(GL_CULL_FACE); + } + +#if 0 + glBegin(GL_POLYGON); + glColor3f(1, 0, 0); + glVertex2f(-1, -1); + glColor3f(0, 1, 0); + glVertex2f(1, -1); + glColor3f(0, 0, 1); + glVertex2f(0, 1); + glEnd(); +#else + glEnable(GL_LIGHTING); + glEnable(GL_LIGHT0); + glPushMatrix(); + glRotatef(0.5 * Rot, 1.0, 0.0, 0.0); + glFrontFace(GL_CW); /* Teapot patches backward */ + glutSolidTeapot(0.5); + glFrontFace(GL_CCW); + glPopMatrix(); + glDisable(GL_LIGHTING); + /* + PrintStencilHistogram(TexWidth, TexHeight); + */ +#endif + + glDisable(GL_DEPTH_TEST); + glDisable(GL_STENCIL_TEST); + glDisable(GL_CULL_FACE); + glPolygonMode(GL_FRONT_AND_BACK, GL_FILL); + +#if DRAW + /* Bind normal framebuffer */ + glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0); +#endif + + CheckError(__LINE__); +} + + + +static void +Display(void) +{ + float ar = (float) Width / (float) Height; + + RenderTexture(); + + /* draw textured quad in the window */ +#if DRAW + glMatrixMode(GL_PROJECTION); + glLoadIdentity(); + glFrustum(-ar, ar, -1.0, 1.0, 5.0, 25.0); + glMatrixMode(GL_MODELVIEW); + glLoadIdentity(); + glTranslatef(0.0, 0.0, -7.0); + + glViewport(0, 0, Width, Height); + + glClearColor(0.25, 0.25, 0.25, 0); + glClear(GL_COLOR_BUFFER_BIT); + + glPushMatrix(); + glRotatef(Rot, 0, 1, 0); + glEnable(TexTarget); + glBindTexture(TexTarget, TexObj); + glBegin(GL_POLYGON); + glColor3f(0.25, 0.25, 0.25); + if (TexTarget == GL_TEXTURE_2D) { + glTexCoord2f(0, 0); + glVertex2f(-1, -1); + glTexCoord2f(1, 0); + glVertex2f(1, -1); + glColor3f(1.0, 1.0, 1.0); + glTexCoord2f(1, 1); + glVertex2f(1, 1); + glTexCoord2f(0, 1); + glVertex2f(-1, 1); + } + else { + assert(TexTarget == GL_TEXTURE_RECTANGLE_ARB); + glTexCoord2f(0, 0); + glVertex2f(-1, -1); + glTexCoord2f(TexWidth, 0); + glVertex2f(1, -1); + glColor3f(1.0, 1.0, 1.0); + glTexCoord2f(TexWidth, TexHeight); + glVertex2f(1, 1); + glTexCoord2f(0, TexHeight); + glVertex2f(-1, 1); + } + glEnd(); + glPopMatrix(); + glDisable(TexTarget); +#endif + + glutSwapBuffers(); + CheckError(__LINE__); +} + + +static void +Reshape(int width, int height) +{ + glViewport(0, 0, width, height); + Width = width; + Height = height; +} + + +static void +CleanUp(void) +{ +#if DEPTH + glDeleteRenderbuffersEXT(1, &DepthRB); +#endif +#if STENCIL + glDeleteRenderbuffersEXT(1, &StencilRB); +#endif + glDeleteFramebuffersEXT(1, &MyFB); + + glDeleteTextures(1, &TexObj); + + glutDestroyWindow(Win); + + exit(0); +} + + +static void +Key(unsigned char key, int x, int y) +{ + (void) x; + (void) y; + switch (key) { + case 'a': + Anim = !Anim; + if (Anim) + glutIdleFunc(Idle); + else + glutIdleFunc(NULL); + break; + case 'c': + Cull = !Cull; + break; + case 'w': + Wireframe = !Wireframe; + break; + case 's': + Rot += 2.0; + break; + case 'S': + Rot -= 2.0; + break; + case 27: + CleanUp(); + break; + } + glutPostRedisplay(); +} + + +/** + * Attach depth and stencil renderbuffer(s) to the given framebuffer object. + * \param tryDepthStencil if true, try to use a combined depth+stencil buffer + * \param bindDepthStencil if true, and tryDepthStencil is true, bind with + * the GL_DEPTH_STENCIL_ATTACHMENT target. + * \return GL_TRUE for success, GL_FALSE for failure + */ +static GLboolean +AttachDepthAndStencilBuffers(GLuint fbo, + GLsizei width, GLsizei height, + GLboolean tryDepthStencil, + GLboolean bindDepthStencil, + GLuint *depthRbOut, GLuint *stencilRbOut) +{ + GLenum status; + + *depthRbOut = *stencilRbOut = 0; + + glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fbo); + + if (tryDepthStencil) { + GLuint rb; + + glGenRenderbuffersEXT(1, &rb); + glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, rb); + glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, + GL_DEPTH24_STENCIL8_EXT, + width, height); + if (glGetError()) + return GL_FALSE; + + if (bindDepthStencil) { + /* attach to both depth and stencil at once */ + glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, + GL_DEPTH_STENCIL_ATTACHMENT, + GL_RENDERBUFFER_EXT, rb); + if (glGetError()) + return GL_FALSE; + } + else { + /* attach to depth attachment point */ + glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, + GL_DEPTH_ATTACHMENT_EXT, + GL_RENDERBUFFER_EXT, rb); + if (glGetError()) + return GL_FALSE; + + /* and attach to stencil attachment point */ + glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, + GL_STENCIL_ATTACHMENT_EXT, + GL_RENDERBUFFER_EXT, rb); + if (glGetError()) + return GL_FALSE; + } + + status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT); + if (status != GL_FRAMEBUFFER_COMPLETE_EXT) + return GL_FALSE; + + *depthRbOut = *stencilRbOut = rb; + return GL_TRUE; + } + + /* just depth renderbuffer */ + { + GLuint rb; + + glGenRenderbuffersEXT(1, &rb); + glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, rb); + glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, + GL_DEPTH_COMPONENT, + width, height); + if (glGetError()) + return GL_FALSE; + + /* attach to depth attachment point */ + glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, + GL_DEPTH_ATTACHMENT_EXT, + GL_RENDERBUFFER_EXT, rb); + if (glGetError()) + return GL_FALSE; + + status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT); + if (status != GL_FRAMEBUFFER_COMPLETE_EXT) + return GL_FALSE; + + *depthRbOut = rb; + } + + /* just stencil renderbuffer */ + { + GLuint rb; + + glGenRenderbuffersEXT(1, &rb); + glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, rb); + glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, + GL_STENCIL_INDEX, + width, height); + if (glGetError()) + return GL_FALSE; + + /* attach to depth attachment point */ + glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, + GL_STENCIL_ATTACHMENT_EXT, + GL_RENDERBUFFER_EXT, rb); + if (glGetError()) + return GL_FALSE; + + status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT); + if (status != GL_FRAMEBUFFER_COMPLETE_EXT) { + glDeleteRenderbuffersEXT(1, depthRbOut); + *depthRbOut = 0; + glDeleteRenderbuffersEXT(1, &rb); + return GL_FALSE; + } + + *stencilRbOut = rb; + } + + return GL_TRUE; +} + + +static void +ParseArgs(int argc, char *argv[]) +{ + GLint i; + for (i = 1; i < argc; i++) { + if (strcmp(argv[i], "-ds") == 0) { + if (!glutExtensionSupported("GL_EXT_packed_depth_stencil")) { + printf("GL_EXT_packed_depth_stencil not found!\n"); + exit(0); + } + UsePackedDepthStencil = GL_TRUE; + printf("Using GL_EXT_packed_depth_stencil\n"); + } + else if (strcmp(argv[i], "-ds2") == 0) { + if (!glutExtensionSupported("GL_EXT_packed_depth_stencil")) { + printf("GL_EXT_packed_depth_stencil not found!\n"); + exit(0); + } + if (!glutExtensionSupported("GL_ARB_framebuffer_object")) { + printf("GL_ARB_framebuffer_object not found!\n"); + exit(0); + } + UsePackedDepthStencilBoth = GL_TRUE; + printf("Using GL_EXT_packed_depth_stencil and GL_DEPTH_STENCIL attachment point\n"); + } + else if (strcmp(argv[i], "-arb") == 0) { + if (!glutExtensionSupported("GL_ARB_framebuffer_object")) { + printf("Sorry, GL_ARB_framebuffer object not supported!\n"); + } + else { + Use_ARB_fbo = GL_TRUE; + } + } + else { + printf("Unknown option: %s\n", argv[i]); + } + } +} + + +/* + * Make FBO to render into given texture. + */ +static GLuint +MakeFBO_RenderTexture(GLuint TexObj) +{ + GLuint fb; + GLint sizeFudge = 0; + + glGenFramebuffersEXT(1, &fb); + glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fb); + /* Render color to texture */ + glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, + TexTarget, TexObj, TextureLevel); + + if (Use_ARB_fbo) { + /* use a smaller depth buffer to see what happens */ + sizeFudge = 90; + } + + /* Setup depth and stencil buffers */ + { + GLboolean b; + b = AttachDepthAndStencilBuffers(fb, + TexWidth - sizeFudge, + TexHeight - sizeFudge, + UsePackedDepthStencil, + UsePackedDepthStencilBoth, + &DepthRB, &StencilRB); + if (!b) { + /* try !UsePackedDepthStencil */ + b = AttachDepthAndStencilBuffers(fb, + TexWidth - sizeFudge, + TexHeight - sizeFudge, + !UsePackedDepthStencil, + UsePackedDepthStencilBoth, + &DepthRB, &StencilRB); + } + if (!b) { + printf("Unable to create/attach depth and stencil renderbuffers " + " to FBO!\n"); + exit(1); + } + } + + /* queries */ + { + GLint bits, w, h; + + glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, DepthRB); + glGetRenderbufferParameterivEXT(GL_RENDERBUFFER_EXT, + GL_RENDERBUFFER_WIDTH_EXT, &w); + glGetRenderbufferParameterivEXT(GL_RENDERBUFFER_EXT, + GL_RENDERBUFFER_HEIGHT_EXT, &h); + printf("Color/Texture size: %d x %d\n", TexWidth, TexHeight); + printf("Depth buffer size: %d x %d\n", w, h); + + glGetRenderbufferParameterivEXT(GL_RENDERBUFFER_EXT, + GL_RENDERBUFFER_DEPTH_SIZE_EXT, &bits); + printf("Depth renderbuffer size = %d bits\n", bits); + + glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, StencilRB); + glGetRenderbufferParameterivEXT(GL_RENDERBUFFER_EXT, + GL_RENDERBUFFER_STENCIL_SIZE_EXT, &bits); + printf("Stencil renderbuffer size = %d bits\n", bits); + } + + /* bind the regular framebuffer */ + glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0); + + return fb; +} + + +static void +Init(void) +{ + if (!glutExtensionSupported("GL_EXT_framebuffer_object")) { + printf("GL_EXT_framebuffer_object not found!\n"); + exit(0); + } + + printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER)); + + /* lighting */ + { + static const GLfloat mat[4] = { 1.0, 0.5, 0.5, 1.0 }; + glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, mat); + } + + /* + * Make texture object/image (we'll render into this texture) + */ + { + glGenTextures(1, &TexObj); + glBindTexture(TexTarget, TexObj); + + /* make two image levels */ + glTexImage2D(TexTarget, 0, TexIntFormat, TexWidth, TexHeight, 0, + GL_RGBA, GL_UNSIGNED_BYTE, NULL); + if (TexTarget == GL_TEXTURE_2D) { + glTexImage2D(TexTarget, 1, TexIntFormat, TexWidth/2, TexHeight/2, 0, + GL_RGBA, GL_UNSIGNED_BYTE, NULL); + TexWidth = TexWidth >> TextureLevel; + TexHeight = TexHeight >> TextureLevel; + glTexParameteri(TexTarget, GL_TEXTURE_MAX_LEVEL, TextureLevel); + } + + glTexParameteri(TexTarget, GL_TEXTURE_MIN_FILTER, GL_NEAREST); + glTexParameteri(TexTarget, GL_TEXTURE_MAG_FILTER, GL_NEAREST); + glTexParameteri(TexTarget, GL_TEXTURE_BASE_LEVEL, TextureLevel); + glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE); + } + + MyFB = MakeFBO_RenderTexture(TexObj); +} + + +static void +Usage(void) +{ + printf("Usage:\n"); + printf(" -ds Use combined depth/stencil renderbuffer\n"); + printf(" -arb Try GL_ARB_framebuffer_object's mismatched buffer sizes\n"); + printf(" -ds2 Try GL_ARB_framebuffer_object's GL_DEPTH_STENCIL_ATTACHMENT\n"); + printf("Keys:\n"); + printf(" a Toggle animation\n"); + printf(" s/s Step/rotate\n"); + printf(" c Toggle back-face culling\n"); + printf(" w Toggle wireframe mode (front-face only)\n"); + printf(" Esc Exit\n"); +} + + +int +main(int argc, char *argv[]) +{ + glutInit(&argc, argv); + glutInitWindowPosition(0, 0); + glutInitWindowSize(Width, Height); + glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE); + Win = glutCreateWindow(argv[0]); + glewInit(); + glutReshapeFunc(Reshape); + glutKeyboardFunc(Key); + glutDisplayFunc(Display); + if (Anim) + glutIdleFunc(Idle); + + ParseArgs(argc, argv); + Init(); + Usage(); + + glutMainLoop(); + return 0; +} diff --git a/progs/tests/Makefile b/progs/tests/Makefile index cd6c496961c..7dfc65807a3 100644 --- a/progs/tests/Makefile +++ b/progs/tests/Makefile @@ -43,7 +43,6 @@ SOURCES = \ floattex.c \ fbotest1.c \ fbotest2.c \ - fbotexture.c \ fillrate.c \ fog.c \ fogcoord.c \ diff --git a/progs/tests/fbotexture.c b/progs/tests/fbotexture.c deleted file mode 100644 index 50a4b00afce..00000000000 --- a/progs/tests/fbotexture.c +++ /dev/null @@ -1,621 +0,0 @@ -/* - * Test GL_EXT_framebuffer_object render-to-texture - * - * Draw a teapot into a texture image with stenciling. - * Then draw a textured quad using that texture. - * - * Brian Paul - * 18 Apr 2005 - */ - - -#include -#include -#include -#include -#include -#include -#include - -/* For debug */ -#define DEPTH 1 -#define STENCIL 1 -#define DRAW 1 - - -static int Win = 0; -static int Width = 400, Height = 400; - -#if 1 -static GLenum TexTarget = GL_TEXTURE_2D; -static int TexWidth = 512, TexHeight = 512; -static GLenum TexIntFormat = GL_RGB; /* either GL_RGB or GL_RGBA */ -#else -static GLenum TexTarget = GL_TEXTURE_RECTANGLE_ARB; -static int TexWidth = 200, TexHeight = 200; -static GLenum TexIntFormat = GL_RGB5; /* either GL_RGB or GL_RGBA */ -#endif -static GLuint TextureLevel = 0; /* which texture level to render to */ - -static GLuint MyFB; -static GLuint TexObj; -static GLuint DepthRB = 0, StencilRB = 0; -static GLboolean Anim = GL_FALSE; -static GLfloat Rot = 0.0; -static GLboolean UsePackedDepthStencil = GL_FALSE; -static GLboolean UsePackedDepthStencilBoth = GL_FALSE; -static GLboolean Use_ARB_fbo = GL_FALSE; -static GLboolean Cull = GL_FALSE; -static GLboolean Wireframe = GL_FALSE; - - -static void -CheckError(int line) -{ - GLenum err = glGetError(); - if (err) { - printf("GL Error 0x%x at line %d\n", (int) err, line); - } -} - - -static void -Idle(void) -{ - Rot = glutGet(GLUT_ELAPSED_TIME) * 0.1; - glutPostRedisplay(); -} - - -static void -RenderTexture(void) -{ - GLenum status; - - glMatrixMode(GL_PROJECTION); - glLoadIdentity(); - glOrtho(-1.0, 1.0, -1.0, 1.0, 5.0, 25.0); - glMatrixMode(GL_MODELVIEW); - glLoadIdentity(); - glTranslatef(0.0, 0.0, -15.0); - - /* draw to texture image */ - glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, MyFB); - - status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT); - if (status != GL_FRAMEBUFFER_COMPLETE_EXT) { - printf("Framebuffer incomplete!!!\n"); - } - - glViewport(0, 0, TexWidth, TexHeight); - - glClearColor(0.5, 0.5, 1.0, 0.0); - glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT); - CheckError(__LINE__); - -#if DEPTH - glEnable(GL_DEPTH_TEST); -#endif - -#if STENCIL - glEnable(GL_STENCIL_TEST); - glStencilFunc(GL_NEVER, 1, ~0); - glStencilOp(GL_REPLACE, GL_KEEP, GL_REPLACE); -#endif - - CheckError(__LINE__); - -#if DEPTH || STENCIL - /* draw diamond-shaped stencil pattern */ - glColor3f(0, 1, 0); - glBegin(GL_POLYGON); - glVertex2f(-0.2, 0.0); - glVertex2f( 0.0, -0.2); - glVertex2f( 0.2, 0.0); - glVertex2f( 0.0, 0.2); - glEnd(); -#endif - - /* draw teapot where stencil != 1 */ -#if STENCIL - glStencilFunc(GL_NOTEQUAL, 1, ~0); - glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP); -#endif - - CheckError(__LINE__); - - if (Wireframe) { - glPolygonMode(GL_FRONT, GL_LINE); - } - else { - glPolygonMode(GL_FRONT, GL_FILL); - } - - if (Cull) { - /* cull back */ - glCullFace(GL_BACK); - glEnable(GL_CULL_FACE); - } - else { - glDisable(GL_CULL_FACE); - } - -#if 0 - glBegin(GL_POLYGON); - glColor3f(1, 0, 0); - glVertex2f(-1, -1); - glColor3f(0, 1, 0); - glVertex2f(1, -1); - glColor3f(0, 0, 1); - glVertex2f(0, 1); - glEnd(); -#else - glEnable(GL_LIGHTING); - glEnable(GL_LIGHT0); - glPushMatrix(); - glRotatef(0.5 * Rot, 1.0, 0.0, 0.0); - glFrontFace(GL_CW); /* Teapot patches backward */ - glutSolidTeapot(0.5); - glFrontFace(GL_CCW); - glPopMatrix(); - glDisable(GL_LIGHTING); - /* - PrintStencilHistogram(TexWidth, TexHeight); - */ -#endif - - glDisable(GL_DEPTH_TEST); - glDisable(GL_STENCIL_TEST); - glDisable(GL_CULL_FACE); - glPolygonMode(GL_FRONT_AND_BACK, GL_FILL); - -#if DRAW - /* Bind normal framebuffer */ - glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0); -#endif - - CheckError(__LINE__); -} - - - -static void -Display(void) -{ - float ar = (float) Width / (float) Height; - - RenderTexture(); - - /* draw textured quad in the window */ -#if DRAW - glMatrixMode(GL_PROJECTION); - glLoadIdentity(); - glFrustum(-ar, ar, -1.0, 1.0, 5.0, 25.0); - glMatrixMode(GL_MODELVIEW); - glLoadIdentity(); - glTranslatef(0.0, 0.0, -7.0); - - glViewport(0, 0, Width, Height); - - glClearColor(0.25, 0.25, 0.25, 0); - glClear(GL_COLOR_BUFFER_BIT); - - glPushMatrix(); - glRotatef(Rot, 0, 1, 0); - glEnable(TexTarget); - glBindTexture(TexTarget, TexObj); - glBegin(GL_POLYGON); - glColor3f(0.25, 0.25, 0.25); - if (TexTarget == GL_TEXTURE_2D) { - glTexCoord2f(0, 0); - glVertex2f(-1, -1); - glTexCoord2f(1, 0); - glVertex2f(1, -1); - glColor3f(1.0, 1.0, 1.0); - glTexCoord2f(1, 1); - glVertex2f(1, 1); - glTexCoord2f(0, 1); - glVertex2f(-1, 1); - } - else { - assert(TexTarget == GL_TEXTURE_RECTANGLE_ARB); - glTexCoord2f(0, 0); - glVertex2f(-1, -1); - glTexCoord2f(TexWidth, 0); - glVertex2f(1, -1); - glColor3f(1.0, 1.0, 1.0); - glTexCoord2f(TexWidth, TexHeight); - glVertex2f(1, 1); - glTexCoord2f(0, TexHeight); - glVertex2f(-1, 1); - } - glEnd(); - glPopMatrix(); - glDisable(TexTarget); -#endif - - glutSwapBuffers(); - CheckError(__LINE__); -} - - -static void -Reshape(int width, int height) -{ - glViewport(0, 0, width, height); - Width = width; - Height = height; -} - - -static void -CleanUp(void) -{ -#if DEPTH - glDeleteRenderbuffersEXT(1, &DepthRB); -#endif -#if STENCIL - glDeleteRenderbuffersEXT(1, &StencilRB); -#endif - glDeleteFramebuffersEXT(1, &MyFB); - - glDeleteTextures(1, &TexObj); - - glutDestroyWindow(Win); - - exit(0); -} - - -static void -Key(unsigned char key, int x, int y) -{ - (void) x; - (void) y; - switch (key) { - case 'a': - Anim = !Anim; - if (Anim) - glutIdleFunc(Idle); - else - glutIdleFunc(NULL); - break; - case 'c': - Cull = !Cull; - break; - case 'w': - Wireframe = !Wireframe; - break; - case 's': - Rot += 2.0; - break; - case 'S': - Rot -= 2.0; - break; - case 27: - CleanUp(); - break; - } - glutPostRedisplay(); -} - - -/** - * Attach depth and stencil renderbuffer(s) to the given framebuffer object. - * \param tryDepthStencil if true, try to use a combined depth+stencil buffer - * \param bindDepthStencil if true, and tryDepthStencil is true, bind with - * the GL_DEPTH_STENCIL_ATTACHMENT target. - * \return GL_TRUE for success, GL_FALSE for failure - */ -static GLboolean -AttachDepthAndStencilBuffers(GLuint fbo, - GLsizei width, GLsizei height, - GLboolean tryDepthStencil, - GLboolean bindDepthStencil, - GLuint *depthRbOut, GLuint *stencilRbOut) -{ - GLenum status; - - *depthRbOut = *stencilRbOut = 0; - - glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fbo); - - if (tryDepthStencil) { - GLuint rb; - - glGenRenderbuffersEXT(1, &rb); - glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, rb); - glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, - GL_DEPTH24_STENCIL8_EXT, - width, height); - if (glGetError()) - return GL_FALSE; - - if (bindDepthStencil) { - /* attach to both depth and stencil at once */ - glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, - GL_DEPTH_STENCIL_ATTACHMENT, - GL_RENDERBUFFER_EXT, rb); - if (glGetError()) - return GL_FALSE; - } - else { - /* attach to depth attachment point */ - glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, - GL_DEPTH_ATTACHMENT_EXT, - GL_RENDERBUFFER_EXT, rb); - if (glGetError()) - return GL_FALSE; - - /* and attach to stencil attachment point */ - glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, - GL_STENCIL_ATTACHMENT_EXT, - GL_RENDERBUFFER_EXT, rb); - if (glGetError()) - return GL_FALSE; - } - - status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT); - if (status != GL_FRAMEBUFFER_COMPLETE_EXT) - return GL_FALSE; - - *depthRbOut = *stencilRbOut = rb; - return GL_TRUE; - } - - /* just depth renderbuffer */ - { - GLuint rb; - - glGenRenderbuffersEXT(1, &rb); - glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, rb); - glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, - GL_DEPTH_COMPONENT, - width, height); - if (glGetError()) - return GL_FALSE; - - /* attach to depth attachment point */ - glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, - GL_DEPTH_ATTACHMENT_EXT, - GL_RENDERBUFFER_EXT, rb); - if (glGetError()) - return GL_FALSE; - - status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT); - if (status != GL_FRAMEBUFFER_COMPLETE_EXT) - return GL_FALSE; - - *depthRbOut = rb; - } - - /* just stencil renderbuffer */ - { - GLuint rb; - - glGenRenderbuffersEXT(1, &rb); - glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, rb); - glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, - GL_STENCIL_INDEX, - width, height); - if (glGetError()) - return GL_FALSE; - - /* attach to depth attachment point */ - glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, - GL_STENCIL_ATTACHMENT_EXT, - GL_RENDERBUFFER_EXT, rb); - if (glGetError()) - return GL_FALSE; - - status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT); - if (status != GL_FRAMEBUFFER_COMPLETE_EXT) { - glDeleteRenderbuffersEXT(1, depthRbOut); - *depthRbOut = 0; - glDeleteRenderbuffersEXT(1, &rb); - return GL_FALSE; - } - - *stencilRbOut = rb; - } - - return GL_TRUE; -} - - -static void -ParseArgs(int argc, char *argv[]) -{ - GLint i; - for (i = 1; i < argc; i++) { - if (strcmp(argv[i], "-ds") == 0) { - if (!glutExtensionSupported("GL_EXT_packed_depth_stencil")) { - printf("GL_EXT_packed_depth_stencil not found!\n"); - exit(0); - } - UsePackedDepthStencil = GL_TRUE; - printf("Using GL_EXT_packed_depth_stencil\n"); - } - else if (strcmp(argv[i], "-ds2") == 0) { - if (!glutExtensionSupported("GL_EXT_packed_depth_stencil")) { - printf("GL_EXT_packed_depth_stencil not found!\n"); - exit(0); - } - if (!glutExtensionSupported("GL_ARB_framebuffer_object")) { - printf("GL_ARB_framebuffer_object not found!\n"); - exit(0); - } - UsePackedDepthStencilBoth = GL_TRUE; - printf("Using GL_EXT_packed_depth_stencil and GL_DEPTH_STENCIL attachment point\n"); - } - else if (strcmp(argv[i], "-arb") == 0) { - if (!glutExtensionSupported("GL_ARB_framebuffer_object")) { - printf("Sorry, GL_ARB_framebuffer object not supported!\n"); - } - else { - Use_ARB_fbo = GL_TRUE; - } - } - else { - printf("Unknown option: %s\n", argv[i]); - } - } -} - - -/* - * Make FBO to render into given texture. - */ -static GLuint -MakeFBO_RenderTexture(GLuint TexObj) -{ - GLuint fb; - GLint sizeFudge = 0; - - glGenFramebuffersEXT(1, &fb); - glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fb); - /* Render color to texture */ - glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, - TexTarget, TexObj, TextureLevel); - - if (Use_ARB_fbo) { - /* use a smaller depth buffer to see what happens */ - sizeFudge = 90; - } - - /* Setup depth and stencil buffers */ - { - GLboolean b; - b = AttachDepthAndStencilBuffers(fb, - TexWidth - sizeFudge, - TexHeight - sizeFudge, - UsePackedDepthStencil, - UsePackedDepthStencilBoth, - &DepthRB, &StencilRB); - if (!b) { - /* try !UsePackedDepthStencil */ - b = AttachDepthAndStencilBuffers(fb, - TexWidth - sizeFudge, - TexHeight - sizeFudge, - !UsePackedDepthStencil, - UsePackedDepthStencilBoth, - &DepthRB, &StencilRB); - } - if (!b) { - printf("Unable to create/attach depth and stencil renderbuffers " - " to FBO!\n"); - exit(1); - } - } - - /* queries */ - { - GLint bits, w, h; - - glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, DepthRB); - glGetRenderbufferParameterivEXT(GL_RENDERBUFFER_EXT, - GL_RENDERBUFFER_WIDTH_EXT, &w); - glGetRenderbufferParameterivEXT(GL_RENDERBUFFER_EXT, - GL_RENDERBUFFER_HEIGHT_EXT, &h); - printf("Color/Texture size: %d x %d\n", TexWidth, TexHeight); - printf("Depth buffer size: %d x %d\n", w, h); - - glGetRenderbufferParameterivEXT(GL_RENDERBUFFER_EXT, - GL_RENDERBUFFER_DEPTH_SIZE_EXT, &bits); - printf("Depth renderbuffer size = %d bits\n", bits); - - glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, StencilRB); - glGetRenderbufferParameterivEXT(GL_RENDERBUFFER_EXT, - GL_RENDERBUFFER_STENCIL_SIZE_EXT, &bits); - printf("Stencil renderbuffer size = %d bits\n", bits); - } - - /* bind the regular framebuffer */ - glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0); - - return fb; -} - - -static void -Init(void) -{ - if (!glutExtensionSupported("GL_EXT_framebuffer_object")) { - printf("GL_EXT_framebuffer_object not found!\n"); - exit(0); - } - - printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER)); - - /* lighting */ - { - static const GLfloat mat[4] = { 1.0, 0.5, 0.5, 1.0 }; - glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, mat); - } - - /* - * Make texture object/image (we'll render into this texture) - */ - { - glGenTextures(1, &TexObj); - glBindTexture(TexTarget, TexObj); - - /* make two image levels */ - glTexImage2D(TexTarget, 0, TexIntFormat, TexWidth, TexHeight, 0, - GL_RGBA, GL_UNSIGNED_BYTE, NULL); - if (TexTarget == GL_TEXTURE_2D) { - glTexImage2D(TexTarget, 1, TexIntFormat, TexWidth/2, TexHeight/2, 0, - GL_RGBA, GL_UNSIGNED_BYTE, NULL); - TexWidth = TexWidth >> TextureLevel; - TexHeight = TexHeight >> TextureLevel; - glTexParameteri(TexTarget, GL_TEXTURE_MAX_LEVEL, TextureLevel); - } - - glTexParameteri(TexTarget, GL_TEXTURE_MIN_FILTER, GL_NEAREST); - glTexParameteri(TexTarget, GL_TEXTURE_MAG_FILTER, GL_NEAREST); - glTexParameteri(TexTarget, GL_TEXTURE_BASE_LEVEL, TextureLevel); - glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE); - } - - MyFB = MakeFBO_RenderTexture(TexObj); -} - - -static void -Usage(void) -{ - printf("Usage:\n"); - printf(" -ds Use combined depth/stencil renderbuffer\n"); - printf(" -arb Try GL_ARB_framebuffer_object's mismatched buffer sizes\n"); - printf(" -ds2 Try GL_ARB_framebuffer_object's GL_DEPTH_STENCIL_ATTACHMENT\n"); - printf("Keys:\n"); - printf(" a Toggle animation\n"); - printf(" s/s Step/rotate\n"); - printf(" c Toggle back-face culling\n"); - printf(" w Toggle wireframe mode (front-face only)\n"); - printf(" Esc Exit\n"); -} - - -int -main(int argc, char *argv[]) -{ - glutInit(&argc, argv); - glutInitWindowPosition(0, 0); - glutInitWindowSize(Width, Height); - glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE); - Win = glutCreateWindow(argv[0]); - glewInit(); - glutReshapeFunc(Reshape); - glutKeyboardFunc(Key); - glutDisplayFunc(Display); - if (Anim) - glutIdleFunc(Idle); - - ParseArgs(argc, argv); - Init(); - Usage(); - - glutMainLoop(); - return 0; -}