diff options
| -rw-r--r-- | progs/glsl/Makefile | 8 | ||||
| -rw-r--r-- | progs/glsl/pointcoord.c | 205 |
2 files changed, 213 insertions, 0 deletions
diff --git a/progs/glsl/Makefile b/progs/glsl/Makefile index e3f205cdb9..7a13c189d0 100644 --- a/progs/glsl/Makefile +++ b/progs/glsl/Makefile @@ -18,6 +18,7 @@ PROGS = \ multitex \ noise \ points \ + pointcoord \ texdemo1 \ toyball \ twoside \ @@ -124,6 +125,13 @@ points: points.o shaderutil.o $(CC) -I$(INCDIR) $(CFLAGS) $(LDFLAGS) points.o shaderutil.o $(LIBS) -o $@ +pointcoord.o: pointcoord.c readtex.h extfuncs.h shaderutil.h + $(CC) -c -I$(INCDIR) $(CFLAGS) pointcoord.c + +pointcoord: pointcoord.o readtex.o shaderutil.o + $(CC) -I$(INCDIR) $(CFLAGS) $(LDFLAGS) pointcoord.o readtex.o shaderutil.o $(LIBS) -o $@ + + texdemo1.o: texdemo1.c readtex.h extfuncs.h shaderutil.h $(CC) -c -I$(INCDIR) $(CFLAGS) texdemo1.c diff --git a/progs/glsl/pointcoord.c b/progs/glsl/pointcoord.c new file mode 100644 index 0000000000..b240077c25 --- /dev/null +++ b/progs/glsl/pointcoord.c @@ -0,0 +1,205 @@ +/** + * Test GLSL 1.20 gl_PointCoord fragment program attribute. + * Brian Paul + * 11 Aug 2007 + */ + + +#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 = 300, WinHeight = 300; +static char *FragProgFile = NULL; +static char *VertProgFile = NULL; +static GLuint fragShader; +static GLuint vertShader; +static GLuint program; +static GLint win = 0; +static GLint tex0; +static GLenum Filter = GL_NEAREST; + + +static void +Redisplay(void) +{ + glClear(GL_COLOR_BUFFER_BIT); + + /* draw one point/sprite */ + glPushMatrix(); + glPointSize(60); + glBegin(GL_POINTS); + glVertex2f(WinWidth / 2.0f, WinHeight / 2.0f); + glEnd(); + glPopMatrix(); + + glutSwapBuffers(); +} + + +static void +Reshape(int width, int height) +{ + glViewport(0, 0, width, height); + glMatrixMode(GL_PROJECTION); + glLoadIdentity(); + glOrtho(0, width, 0, height, -1, 1); + + 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 27: + CleanUp(); + exit(0); + break; + } + glutPostRedisplay(); +} + + + +static void +MakeTexture(void) +{ +#define SZ 16 + GLubyte image[SZ][SZ][4]; + GLuint i, j; + + for (i = 0; i < SZ; i++) { + for (j = 0; j < SZ; j++) { + if ((i + j) & 1) { + image[i][j][0] = 0; + image[i][j][1] = 0; + image[i][j][2] = 0; + image[i][j][3] = 255; + } + else { + image[i][j][0] = j * 255 / (SZ-1); + image[i][j][1] = i * 255 / (SZ-1); + image[i][j][2] = 0; + image[i][j][3] = 255; + } + } + } + + glActiveTexture(GL_TEXTURE0); /* unit 0 */ + glBindTexture(GL_TEXTURE_2D, 42); + glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, SZ, SZ, 0, + GL_RGBA, GL_UNSIGNED_BYTE, image); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, Filter); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, Filter); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); +#undef SZ +} + + +static void +Init(void) +{ + static const char *fragShaderText = + "#version 120 \n" + "uniform sampler2D tex0; \n" + "void main() { \n" + " gl_FragColor = texture2D(tex0, gl_PointCoord.xy, 0.0); \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); + + tex0 = glGetUniformLocation_func(program, "tex0"); + printf("Uniforms: tex0: %d\n", tex0); + + glUniform1i_func(tex0, 0); /* tex unit 0 */ + + /*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)); + + MakeTexture(); + + glEnable(GL_POINT_SPRITE); + + 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(); + glutMainLoop(); + return 0; +} |