diff options
| -rw-r--r-- | progs/glsl/Makefile | 8 | ||||
| -rw-r--r-- | progs/glsl/fragcoord.c | 185 |
2 files changed, 193 insertions, 0 deletions
diff --git a/progs/glsl/Makefile b/progs/glsl/Makefile index c5d62d2370..9f5a2b7df5 100644 --- a/progs/glsl/Makefile +++ b/progs/glsl/Makefile @@ -16,6 +16,7 @@ PROGS = \ convolutions \ deriv \ identity \ + fragcoord \ mandelbrot \ multitex \ noise \ @@ -115,6 +116,13 @@ identity: identity.o shaderutil.o $(APP_CC) -I$(INCDIR) $(CFLAGS) $(LDFLAGS) identity.o shaderutil.o $(LIBS) -o $@ +fragcoord.o: fragcoord.c extfuncs.h shaderutil.h + $(CC) -c -I$(INCDIR) $(CFLAGS) fragcoord.c + +fragcoord: fragcoord.o shaderutil.o + $(CC) -I$(INCDIR) $(CFLAGS) $(LDFLAGS) fragcoord.o shaderutil.o $(LIBS) -o $@ + + mandelbrot.o: mandelbrot.c extfuncs.h shaderutil.h $(APP_CC) -c -I$(INCDIR) $(CFLAGS) mandelbrot.c diff --git a/progs/glsl/fragcoord.c b/progs/glsl/fragcoord.c new file mode 100644 index 0000000000..0b7561f3e4 --- /dev/null +++ b/progs/glsl/fragcoord.c @@ -0,0 +1,185 @@ +/** + * Test GLSL gl_FragCoord fragment program attribute. + * Color the quad's fragments according to their window position. + * + * Brian Paul + * 20 Nov 2008 + */ + + +#include <assert.h> +#include <string.h> +#include <stdio.h> +#include <stdlib.h> +#include <math.h> +#include <GL/gl.h> +#include <GL/glut.h> +#include <GL/glext.h> +#include "extfuncs.h" +#include "shaderutil.h" + + +static GLint WinWidth = 200, WinHeight = 200; +static char *FragProgFile = NULL; +static char *VertProgFile = NULL; +static GLuint fragShader; +static GLuint vertShader; +static GLuint program; +static GLint win = 0; +static GLboolean Anim = GL_TRUE; +static GLfloat PosX = 0.0, PosY = 0.0; + + +static void +Idle(void) +{ + float r = (WinWidth < WinHeight) ? WinWidth : WinHeight; + float a = glutGet(GLUT_ELAPSED_TIME) * 0.001; + r *= 0.25; + PosX = WinWidth / 2 + r * cos(a); + PosY = WinHeight / 2 + r * sin(a); + + glutPostRedisplay(); +} + + +static void +Redisplay(void) +{ + glClear(GL_COLOR_BUFFER_BIT); + + glPushMatrix(); + glTranslatef(PosX, PosY, 0.0); +#if 0 + glBegin(GL_POLYGON); + glVertex2f(-50, -50); + glVertex2f( 50, -50); + glVertex2f( 50, 50); + glVertex2f(-50, 50); + glEnd(); +#else + glutSolidSphere(50, 20, 10); +#endif + glPopMatrix(); + + glutSwapBuffers(); +} + + +static void +Reshape(int width, int height) +{ + glViewport(0, 0, width, height); + glMatrixMode(GL_PROJECTION); + glLoadIdentity(); + glOrtho(0, width, 0, height, -55, 55); + + glMatrixMode(GL_MODELVIEW); + glLoadIdentity(); + + WinWidth = width; + WinHeight = height; +} + + +static void +CleanUp(void) +{ + glDeleteShader_func(fragShader); + glDeleteShader_func(vertShader); + glDeleteProgram_func(program); + glutDestroyWindow(win); +} + + +static void +Key(unsigned char key, int x, int y) +{ + (void) x; + (void) y; + + switch(key) { + case ' ': + case 'a': + Anim = !Anim; + glutIdleFunc(Anim ? Idle : NULL); + break; + case 27: + CleanUp(); + exit(0); + break; + } + glutPostRedisplay(); +} + + +static void +Init(void) +{ + static const char *fragShaderText = + "void main() { \n" + " vec4 scale = vec4(.005, 0.005, 0.5, 1.0);\n" + " gl_FragColor = gl_FragCoord * scale; \n" + "}\n"; + static const char *vertShaderText = + "void main() {\n" + " gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;\n" + "}\n"; + + if (!ShadersSupported()) + exit(1); + + GetExtensionFuncs(); + + vertShader = CompileShaderText(GL_VERTEX_SHADER, vertShaderText); + fragShader = CompileShaderText(GL_FRAGMENT_SHADER, fragShaderText); + program = LinkShaders(vertShader, fragShader); + + glUseProgram_func(program); + + /*assert(glGetError() == 0);*/ + + glClearColor(0.3f, 0.3f, 0.3f, 0.0f); + + printf("GL_RENDERER = %s\n",(const char *) glGetString(GL_RENDERER)); + + assert(glIsProgram_func(program)); + assert(glIsShader_func(fragShader)); + assert(glIsShader_func(vertShader)); + + glColor3f(1, 0, 0); +} + + +static void +ParseOptions(int argc, char *argv[]) +{ + int i; + for (i = 1; i < argc; i++) { + if (strcmp(argv[i], "-fs") == 0) { + FragProgFile = argv[i+1]; + } + else if (strcmp(argv[i], "-vs") == 0) { + VertProgFile = argv[i+1]; + } + } +} + + +int +main(int argc, char *argv[]) +{ + glutInit(&argc, argv); + glutInitWindowPosition( 0, 0); + glutInitWindowSize(WinWidth, WinHeight); + glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE); + win = glutCreateWindow(argv[0]); + glutReshapeFunc(Reshape); + glutKeyboardFunc(Key); + glutDisplayFunc(Redisplay); + ParseOptions(argc, argv); + Init(); + glutIdleFunc(Anim ? Idle : NULL); + glutMainLoop(); + return 0; +} |