--- /dev/null
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+
+#ifndef WIN32
+#include <unistd.h>
+#include <signal.h>
+#endif
+
+#include <GL/glew.h>
+#include <GL/glut.h>
+
+#include "readtex.c"
+
+
+#define TEXTURE_FILE "../images/bw.rgb"
+
+unsigned show_fps = 0;
+unsigned int frame_cnt = 0;
+void alarmhandler(int);
+static const char *filename = NULL;
+
+static GLuint fragShader;
+static GLuint vertShader;
+static GLuint program;
+
+
+static void usage(char *name)
+{
+ fprintf(stderr, "usage: %s [ options ] shader_filename\n", name);
+#ifndef WIN32
+ fprintf(stderr, "\n" );
+ fprintf(stderr, "options:\n");
+ fprintf(stderr, " -fps show frames per second\n");
+#endif
+}
+
+#ifndef WIN32
+void alarmhandler (int sig)
+{
+ if (sig == SIGALRM) {
+ printf("%d frames in 5.0 seconds = %.3f FPS\n", frame_cnt,
+ frame_cnt / 5.0);
+
+ frame_cnt = 0;
+ }
+ signal(SIGALRM, alarmhandler);
+ alarm(5);
+}
+#endif
+
+
+
+
+static void load_and_compile_shader(GLuint shader, const char *text)
+{
+ GLint stat;
+
+ glShaderSource(shader, 1, (const GLchar **) &text, NULL);
+
+ glCompileShader(shader);
+
+ glGetShaderiv(shader, GL_COMPILE_STATUS, &stat);
+ if (!stat) {
+ GLchar log[1000];
+ GLsizei len;
+ glGetShaderInfoLog(shader, 1000, &len, log);
+ fprintf(stderr, "fp-tri: problem compiling shader:\n%s\n", log);
+ exit(1);
+ }
+}
+
+static void read_shader(GLuint shader, const char *filename)
+{
+ const int max = 100*1000;
+ int n;
+ char *buffer = (char*) malloc(max);
+ FILE *f = fopen(filename, "r");
+ if (!f) {
+ fprintf(stderr, "fp-tri: Unable to open shader file %s\n", filename);
+ exit(1);
+ }
+
+ n = fread(buffer, 1, max, f);
+ printf("fp-tri: read %d bytes from shader file %s\n", n, filename);
+ if (n > 0) {
+ buffer[n] = 0;
+ load_and_compile_shader(shader, buffer);
+ }
+
+ fclose(f);
+ free(buffer);
+}
+
+static void check_link(GLuint prog)
+{
+ GLint stat;
+ glGetProgramiv(prog, GL_LINK_STATUS, &stat);
+ if (!stat) {
+ GLchar log[1000];
+ GLsizei len;
+ glGetProgramInfoLog(prog, 1000, &len, log);
+ fprintf(stderr, "Linker error:\n%s\n", log);
+ }
+}
+
+static void setup_uniforms()
+{
+ {
+ GLint loc1f = glGetUniformLocationARB(program, "Offset1f");
+ GLint loc2f = glGetUniformLocationARB(program, "Offset2f");
+ GLint loc4f = glGetUniformLocationARB(program, "Offset4f");
+ GLfloat vecKer[] =
+ { 1.0, 0.0, 0.0, 1.0,
+ 0.0, 1.0, 0.0, 1.0,
+ 1.0, 0.0, 0.0, 1.0,
+ 0.0, 0.0, 0.0, 1.0
+ };
+ if (loc1f >= 0)
+ glUniform1fv(loc1f, 16, vecKer);
+
+ if (loc2f >= 0)
+ glUniform2fv(loc2f, 8, vecKer);
+
+ if (loc4f >= 0)
+ glUniform4fv(loc4f, 4, vecKer);
+
+ }
+
+ {
+ GLint loc1f = glGetUniformLocationARB(program, "KernelValue1f");
+ GLint loc2f = glGetUniformLocationARB(program, "KernelValue2f");
+ GLint loc4f = glGetUniformLocationARB(program, "KernelValue4f");
+ GLfloat vecKer[] =
+ { 1.0, 0.0, 0.0, 0.25,
+ 0.0, 1.0, 0.0, 0.25,
+ 0.0, 0.0, 1.0, 0.25,
+ 0.0, 0.0, 0.0, 0.25,
+ 0.5, 0.0, 0.0, 0.35,
+ 0.0, 0.5, 0.0, 0.35,
+ 0.0, 0.0, 0.5, 0.35,
+ 0.0, 0.0, 0.0, 0.35
+ };
+ if (loc1f >= 0)
+ glUniform1fv(loc1f, 16, vecKer);
+
+ if (loc2f >= 0)
+ glUniform2fv(loc2f, 8, vecKer);
+
+ if (loc4f >= 0)
+ glUniform4fv(loc4f, 4, vecKer);
+ }
+}
+
+static void prepare_shaders()
+{
+ static const char *fragShaderText =
+ "void main() {\n"
+ " gl_FragColor = gl_Color;\n"
+ "}\n";
+ static const char *vertShaderText =
+ "void main() {\n"
+ " gl_FrontColor = gl_Color;\n"
+ " gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;\n"
+ "}\n";
+ fragShader = glCreateShader(GL_FRAGMENT_SHADER);
+ if (filename)
+ read_shader(fragShader, filename);
+ else
+ load_and_compile_shader(fragShader, fragShaderText);
+
+
+ vertShader = glCreateShader(GL_VERTEX_SHADER);
+ load_and_compile_shader(vertShader, vertShaderText);
+
+ program = glCreateProgram();
+ glAttachShader(program, fragShader);
+ glAttachShader(program, vertShader);
+ glLinkProgram(program);
+ check_link(program);
+ glUseProgram(program);
+
+ setup_uniforms();
+}
+
+#define LEVELS 8
+#define SIZE (1<<LEVELS)
+static int TexWidth = SIZE, TexHeight = SIZE;
+
+
+static void
+ResetTextureLevel( int i )
+{
+ GLubyte tex2d[SIZE*SIZE][4];
+
+ {
+ GLint Width = TexWidth / (1 << i);
+ GLint Height = TexHeight / (1 << i);
+ GLint s, t;
+
+ for (s = 0; s < Width; s++) {
+ for (t = 0; t < Height; t++) {
+ tex2d[t*Width+s][0] = ((s / 16) % 2) ? 0 : 255;
+ tex2d[t*Width+s][1] = ((t / 16) % 2) ? 0 : 255;
+ tex2d[t*Width+s][2] = 128;
+ tex2d[t*Width+s][3] = 255;
+ }
+ }
+
+ glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+
+ glTexImage2D(GL_TEXTURE_2D, i, GL_RGB, Width, Height, 0,
+ GL_RGBA, GL_UNSIGNED_BYTE, tex2d);
+ }
+}
+
+
+static void
+ResetTexture( void )
+{
+ int i;
+
+ for (i = 0; i <= LEVELS; i++)
+ {
+ ResetTextureLevel(i);
+ }
+}
+
+static void Init( void )
+{
+ GLuint Texture;
+
+ /* Load texture */
+ glGenTextures(1, &Texture);
+ glBindTexture(GL_TEXTURE_2D, Texture);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+ glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+ if (!LoadRGBMipmaps(TEXTURE_FILE, GL_RGB)) {
+ printf("Error: couldn't load texture image file %s\n", TEXTURE_FILE);
+ exit(1);
+ }
+
+
+ glGenTextures(1, &Texture);
+ glActiveTextureARB(GL_TEXTURE0_ARB + 1);
+ glBindTexture(GL_TEXTURE_2D, Texture);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+ glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+
+ {
+ GLubyte data[32][32];
+ int width = 32;
+ int height = 32;
+ int i;
+ int j;
+
+ for (i = 0; i < 32; i++)
+ for (j = 0; j < 32; j++)
+ {
+ /**
+ ** +-----------+
+ ** | W |
+ ** | +-----+ |
+ ** | | | |
+ ** | | B | |
+ ** | | | |
+ ** | +-----+ |
+ ** | |
+ ** +-----------+
+ **/
+ int i2 = i - height / 2;
+ int j2 = j - width / 2;
+ int h8 = height / 8;
+ int w8 = width / 8;
+ if ( -h8 <= i2 && i2 <= h8 && -w8 <= j2 && j2 <= w8 ) {
+ data[i][j] = 0x00;
+ } else if ( -2 * h8 <= i2 && i2 <= 2 * h8 && -2 * w8 <= j2 && j2 <= 2 * w8 ) {
+ data[i][j] = 0x55;
+ } else if ( -3 * h8 <= i2 && i2 <= 3 * h8 && -3 * w8 <= j2 && j2 <= 3 * w8 ) {
+ data[i][j] = 0xaa;
+ } else {
+ data[i][j] = 0xff;
+ }
+ }
+
+ glTexImage2D( GL_TEXTURE_2D, 0,
+ GL_ALPHA8,
+ 32, 32, 0,
+ GL_ALPHA, GL_UNSIGNED_BYTE, data );
+ }
+
+ glGenTextures(1, &Texture);
+ glActiveTextureARB(GL_TEXTURE0_ARB + 2);
+ glBindTexture(GL_TEXTURE_2D, Texture);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST_MIPMAP_NEAREST);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+ glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+ ResetTexture();
+
+ glClearColor(.1, .3, .5, 0);
+}
+
+
+
+
+static void args(int argc, char *argv[])
+{
+ GLint i;
+
+ for (i = 1; i < argc; i++) {
+ if (strcmp(argv[i], "-fps") == 0) {
+ show_fps = 1;
+ }
+ else if (i == argc - 1) {
+ filename = argv[i];
+ }
+ else {
+ usage(argv[0]);
+ exit(1);
+ }
+ }
+}
+
+
+
+
+
+static void Reshape(int width, int height)
+{
+
+ glViewport(0, 0, (GLint)width, (GLint)height);
+
+ glMatrixMode(GL_PROJECTION);
+ glLoadIdentity();
+ glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
+ glMatrixMode(GL_MODELVIEW);
+}
+
+static void CleanUp(void)
+{
+ glDeleteShader(fragShader);
+ glDeleteShader(vertShader);
+ glDeleteProgram(program);
+}
+
+static void Key(unsigned char key, int x, int y)
+{
+
+ switch (key) {
+ case 27:
+ CleanUp();
+ exit(1);
+ default:
+ break;
+ }
+
+ glutPostRedisplay();
+}
+
+static void Display(void)
+{
+ glClear(GL_COLOR_BUFFER_BIT);
+
+ glUseProgram(program);
+ glProgramLocalParameter4fARB(GL_FRAGMENT_PROGRAM_ARB, 0, 1.0, 1.0, 0.0, 0.0);
+ glProgramLocalParameter4fARB(GL_FRAGMENT_PROGRAM_ARB, 1, 0.0, 0.0, 1.0, 1.0);
+ glBegin(GL_TRIANGLES);
+
+ glColor3f(0,0,1);
+ glTexCoord3f(1,1,0);
+ glVertex3f( 0.9, -0.9, -30.0);
+
+ glColor3f(1,0,0);
+ glTexCoord3f(1,-1,0);
+ glVertex3f( 0.9, 0.9, -30.0);
+
+ glColor3f(0,1,0);
+ glTexCoord3f(-1,0,0);
+ glVertex3f(-0.9, 0.0, -30.0);
+ glEnd();
+
+ glFlush();
+ if (show_fps) {
+ ++frame_cnt;
+ glutPostRedisplay();
+ }
+}
+
+
+int main(int argc, char **argv)
+{
+ glutInit(&argc, argv);
+ glutInitWindowPosition(0, 0);
+ glutInitWindowSize(250, 250);
+ glutInitDisplayMode(GLUT_RGB | GLUT_SINGLE | GLUT_DEPTH);
+ args(argc, argv);
+ glutCreateWindow(filename ? filename : "fp-tri");
+ glewInit();
+ glutReshapeFunc(Reshape);
+ glutKeyboardFunc(Key);
+ glutDisplayFunc(Display);
+ prepare_shaders();
+ Init();
+#ifndef WIN32
+ if (show_fps) {
+ signal(SIGALRM, alarmhandler);
+ alarm(5);
+ }
+#endif
+ glutMainLoop();
+ return 0;
+}
projects / mesa.git / commitdiff