diff options
Diffstat (limited to 'progs')
| -rw-r--r-- | progs/trivial/Makefile | 6 | ||||
| -rw-r--r-- | progs/trivial/fs-tri.c | 207 |
2 files changed, 213 insertions, 0 deletions
diff --git a/progs/trivial/Makefile b/progs/trivial/Makefile index e1ce6b5a1e..2edf0ae008 100644 --- a/progs/trivial/Makefile +++ b/progs/trivial/Makefile @@ -12,6 +12,7 @@ LIBS = $(APP_LIB_DEPS) SOURCES = \ clear.c \ + fs-tri.c \ line-clip.c \ line-cull.c \ line-userclip-clip.c \ @@ -138,6 +139,11 @@ readtex.c: $(TOP)/progs/util/readtex.c ln -s $(TOP)/progs/util/readtex.c . +fs-tri: fs-tri.c extfuncs.h + + +extfuncs.h: $(TOP)/progs/util/extfuncs.h + cp $< . # Emacs tags diff --git a/progs/trivial/fs-tri.c b/progs/trivial/fs-tri.c new file mode 100644 index 0000000000..ecb13fd56d --- /dev/null +++ b/progs/trivial/fs-tri.c @@ -0,0 +1,207 @@ +/* Test fragment shader */ + +#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" + + +static GLuint fragShader; +static GLuint vertShader; +static GLuint program; +static GLint win = 0; +static GLfloat xpos = 0, ypos = 0; + + +static void +Redisplay(void) +{ + glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); + + glPushMatrix(); + glTranslatef(xpos, ypos, 0); + + glBegin(GL_TRIANGLES); + glVertex2f(-0.9, -0.9); + glVertex2f( 0.9, -0.9); + glVertex2f( 0, 0.9); + glEnd(); + + glPopMatrix(); + + glutSwapBuffers(); +} + + +static void +Reshape(int width, int height) +{ + glViewport(0, 0, width, height); + glMatrixMode(GL_PROJECTION); + glLoadIdentity(); + glOrtho(-1, 1, -1, 1, -1, 1); + glMatrixMode(GL_MODELVIEW); + glLoadIdentity(); +} + + +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 +SpecialKey(int key, int x, int y) +{ + const GLfloat step = 0.1; + + (void) x; + (void) y; + + switch(key) { + case GLUT_KEY_UP: + ypos += step; + break; + case GLUT_KEY_DOWN: + ypos -= step; + break; + case GLUT_KEY_LEFT: + xpos -= step; + break; + case GLUT_KEY_RIGHT: + xpos += step; + break; + } + glutPostRedisplay(); +} + + +static void +LoadAndCompileShader(GLuint shader, const char *text) +{ + GLint stat; + + 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, "fslight: problem compiling shader:\n%s\n", log); + exit(1); + } +} + + +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, "Linker error:\n%s\n", log); + } +} + + +static void +Init(void) +{ + /* fragment color is a function of fragment position: */ + static const char *fragShaderText = + "void main() {\n" + " gl_FragColor = gl_FragCoord * vec4(0.005); \n" + "}\n"; +#if 0 + static const char *vertShaderText = + "varying vec3 normal;\n" + "void main() {\n" + " gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;\n" + " normal = gl_NormalMatrix * gl_Normal;\n" + "}\n"; +#endif + const char *version; + + version = (const char *) glGetString(GL_VERSION); + if (version[0] != '2' || version[1] != '.') { + printf("This program requires OpenGL 2.x, found %s\n", version); + exit(1); + } + + GetExtensionFuncs(); + + fragShader = glCreateShader_func(GL_FRAGMENT_SHADER); + LoadAndCompileShader(fragShader, fragShaderText); + +#if 0 + vertShader = glCreateShader_func(GL_VERTEX_SHADER); + LoadAndCompileShader(vertShader, vertShaderText); +#endif + + program = glCreateProgram_func(); + glAttachShader_func(program, fragShader); +#if 0 + glAttachShader_func(program, vertShader); +#endif + glLinkProgram_func(program); + CheckLink(program); + 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)); +} + + +int +main(int argc, char *argv[]) +{ + glutInit(&argc, argv); + glutInitWindowPosition( 0, 0); + glutInitWindowSize(200, 200); + glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH); + win = glutCreateWindow(argv[0]); + glutReshapeFunc(Reshape); + glutKeyboardFunc(Key); + glutSpecialFunc(SpecialKey); + glutDisplayFunc(Redisplay); + Init(); + glutMainLoop(); + return 0; +} + + |