summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorBrian Paul <brianp@vmware.com>2009-12-31 08:46:36 -0700
committerBrian Paul <brianp@vmware.com>2009-12-31 08:49:27 -0700
commit34075d0219edc2cedb5122eb0f82ee0b105b3abd (patch)
treef7ede47d4ea8207fa34daedb3bda169444848a13
parentfcc2e1a729e93bfe64f82d95d007ceab98f3dbc2 (diff)
progs/tests: added test for GL_EXT_draw_buffers2
Render into two color buffers (render targets). Display half of each buffer in the window. Use different color masks for each render target. Only enable blending for the second render target.
-rw-r--r--progs/tests/Makefile1
-rw-r--r--progs/tests/SConscript1
-rw-r--r--progs/tests/drawbuffers2.c364
3 files changed, 366 insertions, 0 deletions
diff --git a/progs/tests/Makefile b/progs/tests/Makefile
index 6f5df2e81e..836396b249 100644
--- a/progs/tests/Makefile
+++ b/progs/tests/Makefile
@@ -42,6 +42,7 @@ SOURCES = \
crossbar.c \
cva.c \
drawbuffers.c \
+ drawbuffers2.c \
exactrast.c \
ext422square.c \
floattex.c \
diff --git a/progs/tests/SConscript b/progs/tests/SConscript
index 38c28a9fe6..ae6488b3e6 100644
--- a/progs/tests/SConscript
+++ b/progs/tests/SConscript
@@ -64,6 +64,7 @@ progs = [
'crossbar',
'cva',
'drawbuffers',
+ 'drawbuffers2',
'exactrast',
'ext422square',
'fbotest1',
diff --git a/progs/tests/drawbuffers2.c b/progs/tests/drawbuffers2.c
new file mode 100644
index 0000000000..7b8cc5ca6a
--- /dev/null
+++ b/progs/tests/drawbuffers2.c
@@ -0,0 +1,364 @@
+/*
+ * Test GL_ARB_draw_buffers2, GL_ARB_draw_buffers, GL_EXT_framebuffer_object
+ * and GLSL's gl_FragData[].
+ *
+ * We draw to two color buffers and show the left half of the first
+ * color buffer on the left side of the window, and show the right
+ * half of the second color buffer on the right side of the window.
+ *
+ * Different color masks are used for the two color buffers.
+ * Blending is enabled for the second buffer only.
+ *
+ * Brian Paul
+ * 31 Dec 2009
+ */
+
+
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+#include <GL/glew.h>
+#include <GL/glut.h>
+#include "extfuncs.h"
+
+static int Win;
+static int Width = 400, Height = 400;
+static GLuint FBobject, RBobjects[3];
+static GLfloat Xrot = 0.0, Yrot = 0.0;
+static GLuint Program;
+static GLboolean Anim = GL_TRUE;
+
+
+static void
+CheckError(int line)
+{
+ GLenum err = glGetError();
+ if (err) {
+ printf("GL Error 0x%x at line %d\n", (int) err, line);
+ }
+}
+
+
+static void
+Display(void)
+{
+ GLubyte *buffer = malloc(Width * Height * 4);
+ static const GLenum buffers[2] = {
+ GL_COLOR_ATTACHMENT0_EXT,
+ GL_COLOR_ATTACHMENT1_EXT
+ };
+
+ glUseProgram_func(Program);
+
+ glEnable(GL_DEPTH_TEST);
+
+ /* draw to user framebuffer */
+ glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, FBobject);
+
+ /* Clear color buffer 0 (blue) */
+ glDrawBuffer(GL_COLOR_ATTACHMENT0_EXT);
+ glClear(GL_COLOR_BUFFER_BIT);
+
+ /* Clear color buffer 1 (1 - blue) */
+ glDrawBuffer(GL_COLOR_ATTACHMENT1_EXT);
+ glClear(GL_COLOR_BUFFER_BIT);
+
+ glClear(GL_DEPTH_BUFFER_BIT);
+
+ /* draw to two buffers w/ fragment shader */
+ glDrawBuffersARB(2, buffers);
+
+ /* different color masks for each buffer */
+ if (1) {
+ glColorMaskIndexedEXT(0, GL_TRUE, GL_FALSE, GL_FALSE, GL_FALSE);
+ glColorMaskIndexedEXT(1, GL_FALSE, GL_TRUE, GL_FALSE, GL_FALSE);
+ }
+
+ glPushMatrix();
+ glRotatef(Xrot, 1, 0, 0);
+ glRotatef(Yrot, 0, 1, 0);
+ glPushMatrix();
+ glTranslatef(1, 0, 0);
+ glutSolidTorus(1.0, 2.0, 10, 20);
+ glPopMatrix();
+ glPushMatrix();
+ glTranslatef(-1, 0, 0);
+ glRotatef(90, 1, 0, 0);
+ glutSolidTorus(1.0, 2.0, 10, 20);
+ glPopMatrix();
+ glPopMatrix();
+
+ /* restore default color masks */
+ glColorMaskIndexedEXT(0, GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
+ glColorMaskIndexedEXT(1, GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
+
+ /* read from user framebuffer */
+ /* left half = colorbuffer 0 */
+ glReadBuffer(GL_COLOR_ATTACHMENT0_EXT);
+ glPixelStorei(GL_PACK_ROW_LENGTH, Width);
+ glPixelStorei(GL_PACK_SKIP_PIXELS, 0);
+ glReadPixels(0, 0, Width / 2, Height, GL_RGBA, GL_UNSIGNED_BYTE,
+ buffer);
+
+ /* right half = colorbuffer 1 */
+ glReadBuffer(GL_COLOR_ATTACHMENT1_EXT);
+ glPixelStorei(GL_PACK_SKIP_PIXELS, Width / 2);
+ glReadPixels(Width / 2, 0, Width - Width / 2, Height,
+ GL_RGBA, GL_UNSIGNED_BYTE,
+ buffer);
+
+ /* draw to window */
+ glUseProgram_func(0);
+ glDisable(GL_DEPTH_TEST);
+ glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
+ glWindowPos2iARB(0, 0);
+ glDrawPixels(Width, Height, GL_RGBA, GL_UNSIGNED_BYTE, buffer);
+
+ free(buffer);
+ glutSwapBuffers();
+ CheckError(__LINE__);
+}
+
+
+static void
+Idle(void)
+{
+ Xrot = glutGet(GLUT_ELAPSED_TIME) * 0.05;
+ glutPostRedisplay();
+}
+
+
+static void
+Reshape(int width, int height)
+{
+ float ar = (float) width / (float) height;
+
+ glViewport(0, 0, width, height);
+ glMatrixMode(GL_PROJECTION);
+ glLoadIdentity();
+ glFrustum(-ar, ar, -1.0, 1.0, 5.0, 35.0);
+ glMatrixMode(GL_MODELVIEW);
+ glLoadIdentity();
+ glTranslatef(0.0, 0.0, -20.0);
+
+ Width = width;
+ Height = height;
+
+ glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, RBobjects[0]);
+ glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_RGB, Width, Height);
+ glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, RBobjects[1]);
+ glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_RGB, Width, Height);
+ glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, RBobjects[2]);
+ glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_DEPTH_COMPONENT,
+ Width, Height);
+}
+
+
+static void
+CleanUp(void)
+{
+ glDeleteFramebuffersEXT(1, &FBobject);
+ glDeleteRenderbuffersEXT(3, RBobjects);
+ glutDestroyWindow(Win);
+ exit(0);
+}
+
+
+static void
+Key(unsigned char key, int x, int y)
+{
+ (void) x;
+ (void) y;
+ switch (key) {
+ case ' ':
+ Anim = !Anim;
+ glutIdleFunc(Anim ? Idle : NULL);
+ break;
+ case 'x':
+ Xrot += 5.0;
+ break;
+ case 'X':
+ Xrot -= 5.0;
+ break;
+ case 'y':
+ Yrot += 5.0;
+ break;
+ case 'Y':
+ Yrot -= 5.0;
+ break;
+ case 27:
+ CleanUp();
+ break;
+ }
+ glutPostRedisplay();
+}
+
+
+static void
+CheckExtensions(void)
+{
+ const char *req[] = {
+ "GL_EXT_framebuffer_object",
+ "GL_ARB_draw_buffers",
+ "GL_EXT_draw_buffers2"
+ };
+
+ const char *version = (const char *) glGetString(GL_VERSION);
+ GLint numBuf;
+ GLint i;
+
+ for (i = 0; i < 3; i++) {
+ if (!glutExtensionSupported(req[i])) {
+ printf("Sorry, %s extension is required!\n", req[i]);
+ exit(1);
+ }
+ }
+ if (version[0] != '2') {
+ printf("Sorry, OpenGL 2.0 is required!\n");
+ exit(1);
+ }
+
+ glGetIntegerv(GL_MAX_DRAW_BUFFERS_ARB, &numBuf);
+ printf("GL_MAX_DRAW_BUFFERS_ARB = %d\n", numBuf);
+ if (numBuf < 2) {
+ printf("Sorry, GL_MAX_DRAW_BUFFERS_ARB needs to be >= 2\n");
+ exit(1);
+ }
+
+ printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
+}
+
+
+static void
+SetupRenderbuffers(void)
+{
+ glGenFramebuffersEXT(1, &FBobject);
+ glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, FBobject);
+
+ glGenRenderbuffersEXT(3, RBobjects);
+
+ glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, RBobjects[0]);
+ glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_RGB, Width, Height);
+
+ glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, RBobjects[1]);
+ glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_RGB, Width, Height);
+
+ glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, RBobjects[2]);
+ glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_DEPTH_COMPONENT,
+ Width, Height);
+
+ glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
+ GL_RENDERBUFFER_EXT, RBobjects[0]);
+ glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT1_EXT,
+ GL_RENDERBUFFER_EXT, RBobjects[1]);
+ glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT,
+ GL_RENDERBUFFER_EXT, RBobjects[2]);
+
+ CheckError(__LINE__);
+}
+
+
+static GLuint
+LoadAndCompileShader(GLenum target, const char *text)
+{
+ GLint stat;
+ GLuint shader = glCreateShader_func(target);
+ glShaderSource_func(shader, 1, (const GLchar **) &text, NULL);
+ glCompileShader_func(shader);
+ glGetShaderiv_func(shader, GL_COMPILE_STATUS, &stat);
+ if (!stat) {
+ GLchar log[1000];
+ GLsizei len;
+ glGetShaderInfoLog_func(shader, 1000, &len, log);
+ fprintf(stderr, "drawbuffers: problem compiling shader:\n%s\n", log);
+ exit(1);
+ }
+ return shader;
+}
+
+
+static void
+CheckLink(GLuint prog)
+{
+ GLint stat;
+ glGetProgramiv_func(prog, GL_LINK_STATUS, &stat);
+ if (!stat) {
+ GLchar log[1000];
+ GLsizei len;
+ glGetProgramInfoLog_func(prog, 1000, &len, log);
+ fprintf(stderr, "drawbuffers: shader link error:\n%s\n", log);
+ }
+}
+
+
+static void
+SetupShaders(void)
+{
+ /* emit same color to both draw buffers */
+ static const char *fragShaderText =
+ "void main() {\n"
+ " gl_FragData[0] = gl_Color; \n"
+ " gl_FragData[1] = gl_Color; \n"
+ "}\n";
+
+ GLuint fragShader;
+
+ fragShader = LoadAndCompileShader(GL_FRAGMENT_SHADER, fragShaderText);
+ Program = glCreateProgram_func();
+
+ glAttachShader_func(Program, fragShader);
+ glLinkProgram_func(Program);
+ CheckLink(Program);
+ glUseProgram_func(Program);
+}
+
+
+static void
+SetupLighting(void)
+{
+ static const GLfloat ambient[4] = { 0.0, 0.0, 0.0, 0.0 };
+ static const GLfloat diffuse[4] = { 1.0, 1.0, 1.0, 0.75 };
+
+ glLightModelfv(GL_LIGHT_MODEL_AMBIENT, ambient);
+ glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT, ambient);
+ glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, diffuse);
+
+ glLightModeli(GL_LIGHT_MODEL_TWO_SIDE, 0);
+ glEnable(GL_LIGHT0);
+ glEnable(GL_LIGHTING);
+}
+
+
+static void
+Init(void)
+{
+ CheckExtensions();
+ GetExtensionFuncs();
+ SetupRenderbuffers();
+ SetupShaders();
+ SetupLighting();
+ glEnable(GL_DEPTH_TEST);
+
+ glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+ glEnableIndexedEXT(GL_BLEND, 1);
+}
+
+
+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();
+ glutIdleFunc(Anim ? Idle : NULL);
+ glutReshapeFunc(Reshape);
+ glutKeyboardFunc(Key);
+ glutDisplayFunc(Display);
+ Init();
+ glutMainLoop();
+ return 0;
+}