+++ /dev/null
-/*
- * Copyright (C) 2008 Tunsgten Graphics,Inc. All Rights Reserved.
- */
-
-/*
- * Draw a lit, textured torus with X/EGL and OpenGL ES 1.x
- * Brian Paul
- * July 2008
- */
-
-
-#include <assert.h>
-#include <math.h>
-#include <stdlib.h>
-#include <stdio.h>
-#include <GLES/gl.h>
-
-#include "eglut.h"
-
-#ifndef M_PI
-#define M_PI 3.14159265
-#endif
-
-static const struct {
- GLenum internalFormat;
- const char *name;
- GLuint num_entries;
- GLuint size;
-} cpal_formats[] = {
- { GL_PALETTE4_RGB8_OES, "GL_PALETTE4_RGB8_OES", 16, 3 },
- { GL_PALETTE4_RGBA8_OES, "GL_PALETTE4_RGBA8_OES", 16, 4 },
- { GL_PALETTE4_R5_G6_B5_OES, "GL_PALETTE4_R5_G6_B5_OES", 16, 2 },
- { GL_PALETTE4_RGBA4_OES, "GL_PALETTE4_RGBA4_OES", 16, 2 },
- { GL_PALETTE4_RGB5_A1_OES, "GL_PALETTE4_RGB5_A1_OES", 16, 2 },
- { GL_PALETTE8_RGB8_OES, "GL_PALETTE8_RGB8_OES", 256, 3 },
- { GL_PALETTE8_RGBA8_OES, "GL_PALETTE8_RGBA8_OES", 256, 4 },
- { GL_PALETTE8_R5_G6_B5_OES, "GL_PALETTE8_R5_G6_B5_OES", 256, 2 },
- { GL_PALETTE8_RGBA4_OES, "GL_PALETTE8_RGBA4_OES", 256, 2 },
- { GL_PALETTE8_RGB5_A1_OES, "GL_PALETTE8_RGB5_A1_OES", 256, 2 }
-};
-#define NUM_CPAL_FORMATS (sizeof(cpal_formats) / sizeof(cpal_formats[0]))
-
-static GLfloat view_rotx = 0.0, view_roty = 0.0, view_rotz = 0.0;
-static GLint tex_format = NUM_CPAL_FORMATS;
-static GLboolean animate = GL_TRUE;
-static int win;
-
-
-static void
-Normal(GLfloat *n, GLfloat nx, GLfloat ny, GLfloat nz)
-{
- n[0] = nx;
- n[1] = ny;
- n[2] = nz;
-}
-
-static void
-Vertex(GLfloat *v, GLfloat vx, GLfloat vy, GLfloat vz)
-{
- v[0] = vx;
- v[1] = vy;
- v[2] = vz;
-}
-
-static void
-Texcoord(GLfloat *v, GLfloat s, GLfloat t)
-{
- v[0] = s;
- v[1] = t;
-}
-
-
-/* Borrowed from glut, adapted */
-static void
-draw_torus(GLfloat r, GLfloat R, GLint nsides, GLint rings)
-{
- int i, j;
- GLfloat theta, phi, theta1;
- GLfloat cosTheta, sinTheta;
- GLfloat cosTheta1, sinTheta1;
- GLfloat ringDelta, sideDelta;
- GLfloat varray[100][3], narray[100][3], tarray[100][2];
- int vcount;
-
- glVertexPointer(3, GL_FLOAT, 0, varray);
- glNormalPointer(GL_FLOAT, 0, narray);
- glTexCoordPointer(2, GL_FLOAT, 0, tarray);
- glEnableClientState(GL_VERTEX_ARRAY);
- glEnableClientState(GL_NORMAL_ARRAY);
- glEnableClientState(GL_TEXTURE_COORD_ARRAY);
-
- ringDelta = 2.0 * M_PI / rings;
- sideDelta = 2.0 * M_PI / nsides;
-
- theta = 0.0;
- cosTheta = 1.0;
- sinTheta = 0.0;
- for (i = rings - 1; i >= 0; i--) {
- theta1 = theta + ringDelta;
- cosTheta1 = cos(theta1);
- sinTheta1 = sin(theta1);
-
- vcount = 0; /* glBegin(GL_QUAD_STRIP); */
-
- phi = 0.0;
- for (j = nsides; j >= 0; j--) {
- GLfloat s0, s1, t;
- GLfloat cosPhi, sinPhi, dist;
-
- phi += sideDelta;
- cosPhi = cos(phi);
- sinPhi = sin(phi);
- dist = R + r * cosPhi;
-
- s0 = 20.0 * theta / (2.0 * M_PI);
- s1 = 20.0 * theta1 / (2.0 * M_PI);
- t = 8.0 * phi / (2.0 * M_PI);
-
- Normal(narray[vcount], cosTheta1 * cosPhi, -sinTheta1 * cosPhi, sinPhi);
- Texcoord(tarray[vcount], s1, t);
- Vertex(varray[vcount], cosTheta1 * dist, -sinTheta1 * dist, r * sinPhi);
- vcount++;
-
- Normal(narray[vcount], cosTheta * cosPhi, -sinTheta * cosPhi, sinPhi);
- Texcoord(tarray[vcount], s0, t);
- Vertex(varray[vcount], cosTheta * dist, -sinTheta * dist, r * sinPhi);
- vcount++;
- }
-
- /*glEnd();*/
- assert(vcount <= 100);
- glDrawArrays(GL_TRIANGLE_STRIP, 0, vcount);
-
- theta = theta1;
- cosTheta = cosTheta1;
- sinTheta = sinTheta1;
- }
-
- glDisableClientState(GL_VERTEX_ARRAY);
- glDisableClientState(GL_NORMAL_ARRAY);
- glDisableClientState(GL_TEXTURE_COORD_ARRAY);
-}
-
-
-static void
-draw(void)
-{
- glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
-
- glPushMatrix();
- glRotatef(view_rotx, 1, 0, 0);
- glRotatef(view_roty, 0, 1, 0);
- glRotatef(view_rotz, 0, 0, 1);
- glScalef(0.5, 0.5, 0.5);
-
- draw_torus(1.0, 3.0, 30, 60);
-
- glPopMatrix();
-}
-
-
-/* new window size or exposure */
-static void
-reshape(int width, int height)
-{
- GLfloat ar = (GLfloat) width / (GLfloat) height;
-
- glViewport(0, 0, (GLint) width, (GLint) height);
-
- glMatrixMode(GL_PROJECTION);
- glLoadIdentity();
-
-#ifdef GL_VERSION_ES_CM_1_0
- glFrustumf(-ar, ar, -1, 1, 5.0, 60.0);
-#else
- glFrustum(-ar, ar, -1, 1, 5.0, 60.0);
-#endif
-
- glMatrixMode(GL_MODELVIEW);
- glLoadIdentity();
- glTranslatef(0.0, 0.0, -15.0);
-}
-
-
-static GLint
-make_cpal_texture(GLint idx)
-{
-#define SZ 64
- GLenum internalFormat = GL_PALETTE4_RGB8_OES + idx;
- GLenum Filter = GL_LINEAR;
- GLubyte palette[256 * 4 + SZ * SZ];
- GLubyte *indices;
- GLsizei image_size;
- GLuint i, j;
- GLuint packed_indices = 0;
-
- assert(cpal_formats[idx].internalFormat == internalFormat);
-
- /* init palette */
- switch (internalFormat) {
- case GL_PALETTE4_RGB8_OES:
- case GL_PALETTE8_RGB8_OES:
- /* first entry */
- palette[0] = 255;
- palette[1] = 255;
- palette[2] = 255;
- /* second entry */
- palette[3] = 127;
- palette[4] = 127;
- palette[5] = 127;
- break;
- case GL_PALETTE4_RGBA8_OES:
- case GL_PALETTE8_RGBA8_OES:
- /* first entry */
- palette[0] = 255;
- palette[1] = 255;
- palette[2] = 255;
- palette[3] = 255;
- /* second entry */
- palette[4] = 127;
- palette[5] = 127;
- palette[6] = 127;
- palette[7] = 255;
- break;
- case GL_PALETTE4_R5_G6_B5_OES:
- case GL_PALETTE8_R5_G6_B5_OES:
- {
- GLushort *pal = (GLushort *) palette;
- /* first entry */
- pal[0] = (31 << 11 | 63 << 5 | 31);
- /* second entry */
- pal[1] = (15 << 11 | 31 << 5 | 15);
- }
- break;
- case GL_PALETTE4_RGBA4_OES:
- case GL_PALETTE8_RGBA4_OES:
- {
- GLushort *pal = (GLushort *) palette;
- /* first entry */
- pal[0] = (15 << 12 | 15 << 8 | 15 << 4 | 15);
- /* second entry */
- pal[1] = (7 << 12 | 7 << 8 | 7 << 4 | 15);
- }
- break;
- case GL_PALETTE4_RGB5_A1_OES:
- case GL_PALETTE8_RGB5_A1_OES:
- {
- GLushort *pal = (GLushort *) palette;
- /* first entry */
- pal[0] = (31 << 11 | 31 << 6 | 31 << 1 | 1);
- /* second entry */
- pal[1] = (15 << 11 | 15 << 6 | 15 << 1 | 1);
- }
- break;
- }
-
- image_size = cpal_formats[idx].size * cpal_formats[idx].num_entries;
- indices = palette + image_size;
- for (i = 0; i < SZ; i++) {
- for (j = 0; j < SZ; j++) {
- GLfloat d;
- GLint index;
- d = (i - SZ/2) * (i - SZ/2) + (j - SZ/2) * (j - SZ/2);
- d = sqrt(d);
- index = (d < SZ / 3) ? 0 : 1;
-
- if (cpal_formats[idx].num_entries == 16) {
- /* 4-bit indices packed in GLubyte */
- packed_indices |= index << (4 * (1 - (j % 2)));
- if (j % 2) {
- *(indices + (i * SZ + j - 1) / 2) = packed_indices & 0xff;
- packed_indices = 0;
- image_size += 1;
- }
- }
- else {
- /* 8-bit indices */
- *(indices + i * SZ + j) = index;
- image_size += 1;
- }
- }
- }
-
- glActiveTexture(GL_TEXTURE0); /* unit 0 */
- glBindTexture(GL_TEXTURE_2D, 42);
- glCompressedTexImage2D(GL_TEXTURE_2D, 0, internalFormat, SZ, SZ, 0,
- image_size, palette);
-
- 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_REPEAT);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
-#undef SZ
-
- return image_size;
-}
-
-
-static GLint
-make_texture(void)
-{
-#define SZ 64
- GLenum Filter = GL_LINEAR;
- GLubyte image[SZ][SZ][4];
- GLuint i, j;
-
- for (i = 0; i < SZ; i++) {
- for (j = 0; j < SZ; j++) {
- GLfloat d = (i - SZ/2) * (i - SZ/2) + (j - SZ/2) * (j - SZ/2);
- d = sqrt(d);
- if (d < SZ/3) {
- image[i][j][0] = 255;
- image[i][j][1] = 255;
- image[i][j][2] = 255;
- image[i][j][3] = 255;
- }
- else {
- image[i][j][0] = 127;
- image[i][j][1] = 127;
- image[i][j][2] = 127;
- 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_REPEAT);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
-#undef SZ
-
- return sizeof(image);
-}
-
-
-
-static void
-init(void)
-{
- static const GLfloat red[4] = {1, 0, 0, 0};
- static const GLfloat white[4] = {1.0, 1.0, 1.0, 1.0};
- static const GLfloat diffuse[4] = {0.7, 0.7, 0.7, 1.0};
- static const GLfloat specular[4] = {0.001, 0.001, 0.001, 1.0};
- static const GLfloat pos[4] = {20, 20, 50, 1};
-
- glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, red);
- glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, white);
- glMaterialf(GL_FRONT_AND_BACK, GL_SHININESS, 9.0);
-
- glEnable(GL_LIGHTING);
- glEnable(GL_LIGHT0);
- glLightfv(GL_LIGHT0, GL_POSITION, pos);
- glLightfv(GL_LIGHT0, GL_DIFFUSE, diffuse);
- glLightfv(GL_LIGHT0, GL_SPECULAR, specular);
-
- glClearColor(0.4, 0.4, 0.4, 0.0);
- glEnable(GL_DEPTH_TEST);
-
- make_texture();
- glEnable(GL_TEXTURE_2D);
-}
-
-
-static void
-idle(void)
-{
- if (animate) {
- view_rotx += 1.0;
- view_roty += 2.0;
- eglutPostRedisplay();
- }
-}
-
-static void
-key(unsigned char key)
-{
- switch (key) {
- case ' ':
- animate = !animate;
- break;
- case 't':
- {
- GLint size;
- tex_format = (tex_format + 1) % (NUM_CPAL_FORMATS + 1);
- if (tex_format < NUM_CPAL_FORMATS) {
- size = make_cpal_texture(tex_format);
- printf("Using %s (%d bytes)\n",
- cpal_formats[tex_format].name, size);
- }
- else {
- size = make_texture();
- printf("Using uncompressed texture (%d bytes)\n", size);
- }
-
- eglutPostRedisplay();
- }
- break;
- case 27:
- eglutDestroyWindow(win);
- exit(0);
- break;
- default:
- break;
- }
-}
-
-static void
-special_key(int key)
-{
- switch (key) {
- case EGLUT_KEY_LEFT:
- view_roty += 5.0;
- break;
- case EGLUT_KEY_RIGHT:
- view_roty -= 5.0;
- break;
- case EGLUT_KEY_UP:
- view_rotx += 5.0;
- break;
- case EGLUT_KEY_DOWN:
- view_rotx -= 5.0;
- break;
- default:
- break;
- }
-}
-
-int
-main(int argc, char *argv[])
-{
- eglutInitWindowSize(300, 300);
- eglutInitAPIMask(EGLUT_OPENGL_ES1_BIT);
- eglutInit(argc, argv);
-
- win = eglutCreateWindow("torus");
-
- eglutIdleFunc(idle);
- eglutReshapeFunc(reshape);
- eglutDisplayFunc(draw);
- eglutKeyboardFunc(key);
- eglutSpecialFunc(special_key);
-
- init();
-
- eglutMainLoop();
-
- return 0;
-}
projects / mesa.git / blobdiff