Jack Palevich | a8fecb8 | 2009-09-23 14:48:07 -0700 | [diff] [blame] | 1 | // OpenGL ES 1.0 code |
| 2 | |
| 3 | #include <nativehelper/jni.h> |
| 4 | #define LOG_TAG "GLJNI gl_code.cpp" |
Jack Palevich | 8018f09 | 2009-09-30 06:14:24 -0700 | [diff] [blame] | 5 | #include <utils/Log.h> |
| 6 | |
Jack Palevich | a8fecb8 | 2009-09-23 14:48:07 -0700 | [diff] [blame] | 7 | #include <GLES/gl.h> |
| 8 | |
Jack Palevich | 8018f09 | 2009-09-30 06:14:24 -0700 | [diff] [blame] | 9 | #include <stdio.h> |
| 10 | |
Jack Palevich | a8fecb8 | 2009-09-23 14:48:07 -0700 | [diff] [blame] | 11 | #include <stdlib.h> |
| 12 | #include <math.h> |
Jack Palevich | 8018f09 | 2009-09-30 06:14:24 -0700 | [diff] [blame] | 13 | |
| 14 | GLuint texture; |
| 15 | GLfloat background; |
| 16 | |
| 17 | #define FIXED_ONE 0x10000 |
Jack Palevich | a8fecb8 | 2009-09-23 14:48:07 -0700 | [diff] [blame] | 18 | |
| 19 | static void printGLString(const char *name, GLenum s) { |
| 20 | const char *v = (const char *) glGetString(s); |
| 21 | LOGI("GL %s = %s\n", name, v); |
| 22 | } |
| 23 | |
| 24 | static void gluLookAt(float eyeX, float eyeY, float eyeZ, |
| 25 | float centerX, float centerY, float centerZ, float upX, float upY, |
| 26 | float upZ) |
| 27 | { |
| 28 | // See the OpenGL GLUT documentation for gluLookAt for a description |
| 29 | // of the algorithm. We implement it in a straightforward way: |
| 30 | |
| 31 | float fx = centerX - eyeX; |
| 32 | float fy = centerY - eyeY; |
| 33 | float fz = centerZ - eyeZ; |
| 34 | |
| 35 | // Normalize f |
| 36 | float rlf = 1.0f / sqrtf(fx*fx + fy*fy + fz*fz); |
| 37 | fx *= rlf; |
| 38 | fy *= rlf; |
| 39 | fz *= rlf; |
| 40 | |
| 41 | // Normalize up |
| 42 | float rlup = 1.0f / sqrtf(upX*upX + upY*upY + upZ*upZ); |
| 43 | upX *= rlup; |
| 44 | upY *= rlup; |
| 45 | upZ *= rlup; |
| 46 | |
| 47 | // compute s = f x up (x means "cross product") |
| 48 | |
| 49 | float sx = fy * upZ - fz * upY; |
| 50 | float sy = fz * upX - fx * upZ; |
| 51 | float sz = fx * upY - fy * upX; |
| 52 | |
| 53 | // compute u = s x f |
| 54 | float ux = sy * fz - sz * fy; |
| 55 | float uy = sz * fx - sx * fz; |
| 56 | float uz = sx * fy - sy * fx; |
| 57 | |
| 58 | float m[16] ; |
| 59 | m[0] = sx; |
| 60 | m[1] = ux; |
| 61 | m[2] = -fx; |
| 62 | m[3] = 0.0f; |
| 63 | |
| 64 | m[4] = sy; |
| 65 | m[5] = uy; |
| 66 | m[6] = -fy; |
| 67 | m[7] = 0.0f; |
| 68 | |
| 69 | m[8] = sz; |
| 70 | m[9] = uz; |
| 71 | m[10] = -fz; |
| 72 | m[11] = 0.0f; |
| 73 | |
| 74 | m[12] = 0.0f; |
| 75 | m[13] = 0.0f; |
| 76 | m[14] = 0.0f; |
| 77 | m[15] = 1.0f; |
| 78 | |
| 79 | glMultMatrixf(m); |
| 80 | glTranslatef(-eyeX, -eyeY, -eyeZ); |
| 81 | } |
| 82 | |
Jack Palevich | 8018f09 | 2009-09-30 06:14:24 -0700 | [diff] [blame] | 83 | void init_scene(int width, int height) |
Jack Palevich | a8fecb8 | 2009-09-23 14:48:07 -0700 | [diff] [blame] | 84 | { |
| 85 | printGLString("Version", GL_VERSION); |
| 86 | printGLString("Vendor", GL_VENDOR); |
| 87 | printGLString("Renderer", GL_RENDERER); |
Jack Palevich | 8018f09 | 2009-09-30 06:14:24 -0700 | [diff] [blame] | 88 | printGLString("Extensions", GL_EXTENSIONS); |
| 89 | |
Jack Palevich | a8fecb8 | 2009-09-23 14:48:07 -0700 | [diff] [blame] | 90 | glDisable(GL_DITHER); |
| 91 | glEnable(GL_CULL_FACE); |
| 92 | |
Jack Palevich | a8fecb8 | 2009-09-23 14:48:07 -0700 | [diff] [blame] | 93 | float ratio = width / height; |
| 94 | glViewport(0, 0, width, height); |
| 95 | |
| 96 | glMatrixMode(GL_PROJECTION); |
| 97 | glLoadIdentity(); |
Jack Palevich | 8018f09 | 2009-09-30 06:14:24 -0700 | [diff] [blame] | 98 | glFrustumf(-ratio, ratio, -1, 1, 1, 10); |
Jack Palevich | a8fecb8 | 2009-09-23 14:48:07 -0700 | [diff] [blame] | 99 | |
Jack Palevich | 8018f09 | 2009-09-30 06:14:24 -0700 | [diff] [blame] | 100 | glMatrixMode(GL_MODELVIEW); |
Jack Palevich | a8fecb8 | 2009-09-23 14:48:07 -0700 | [diff] [blame] | 101 | |
Jack Palevich | a8fecb8 | 2009-09-23 14:48:07 -0700 | [diff] [blame] | 102 | glLoadIdentity(); |
| 103 | gluLookAt( |
| 104 | 0, 0, 3, // eye |
| 105 | 0, 0, 0, // center |
| 106 | 0, 1, 0); // up |
Jack Palevich | 8018f09 | 2009-09-30 06:14:24 -0700 | [diff] [blame] | 107 | |
| 108 | glEnable(GL_TEXTURE_2D); |
| 109 | glEnableClientState(GL_VERTEX_ARRAY); |
Jack Palevich | a8fecb8 | 2009-09-23 14:48:07 -0700 | [diff] [blame] | 110 | glEnableClientState(GL_TEXTURE_COORD_ARRAY); |
Jack Palevich | 8018f09 | 2009-09-30 06:14:24 -0700 | [diff] [blame] | 111 | } |
| 112 | |
| 113 | void create_texture() |
| 114 | { |
Jack Palevich | a8fecb8 | 2009-09-23 14:48:07 -0700 | [diff] [blame] | 115 | const unsigned int on = 0xff0000ff; |
| 116 | const unsigned int off = 0xffffffff; |
| 117 | const unsigned int pixels[] = |
| 118 | { |
| 119 | on, off, on, off, on, off, on, off, |
| 120 | off, on, off, on, off, on, off, on, |
| 121 | on, off, on, off, on, off, on, off, |
| 122 | off, on, off, on, off, on, off, on, |
| 123 | on, off, on, off, on, off, on, off, |
| 124 | off, on, off, on, off, on, off, on, |
| 125 | on, off, on, off, on, off, on, off, |
| 126 | off, on, off, on, off, on, off, on, |
Jack Palevich | 8018f09 | 2009-09-30 06:14:24 -0700 | [diff] [blame] | 127 | }; |
| 128 | |
| 129 | glGenTextures(1, &texture); |
| 130 | glBindTexture(GL_TEXTURE_2D, texture); |
| 131 | glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 8, 8, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixels); |
| 132 | glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); |
| 133 | glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); |
| 134 | glTexEnvx(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE); |
Jack Palevich | a8fecb8 | 2009-09-23 14:48:07 -0700 | [diff] [blame] | 135 | } |
| 136 | |
| 137 | extern "C" { |
| 138 | JNIEXPORT void JNICALL Java_com_android_gljni_GLJNILib_init(JNIEnv * env, jobject obj, jint width, jint height); |
| 139 | JNIEXPORT void JNICALL Java_com_android_gljni_GLJNILib_step(JNIEnv * env, jobject obj); |
Jack Palevich | 8018f09 | 2009-09-30 06:14:24 -0700 | [diff] [blame] | 140 | JNIEXPORT void JNICALL Java_com_android_gljni_GLJNILib_changeBackground(JNIEnv * env, jobject obj); |
Jack Palevich | a8fecb8 | 2009-09-23 14:48:07 -0700 | [diff] [blame] | 141 | }; |
Jack Palevich | a8fecb8 | 2009-09-23 14:48:07 -0700 | [diff] [blame] | 142 | |
Jack Palevich | 8018f09 | 2009-09-30 06:14:24 -0700 | [diff] [blame] | 143 | JNIEXPORT void JNICALL Java_com_android_gljni_GLJNILib_init(JNIEnv * env, jobject obj, jint width, jint height) |
| 144 | { |
| 145 | init_scene(width, height); |
| 146 | create_texture(); |
| 147 | } |
| 148 | |
| 149 | JNIEXPORT void JNICALL Java_com_android_gljni_GLJNILib_step(JNIEnv * env, jobject obj) |
| 150 | { |
| 151 | const GLfloat vertices[] = { |
| 152 | -1, -1, 0, |
| 153 | 1, -1, 0, |
| 154 | 1, 1, 0, |
| 155 | -1, 1, 0 |
| 156 | }; |
| 157 | |
| 158 | const GLfixed texCoords[] = { |
| 159 | 0, 0, |
| 160 | FIXED_ONE, 0, |
| 161 | FIXED_ONE, FIXED_ONE, |
| 162 | 0, FIXED_ONE |
| 163 | }; |
| 164 | |
Jack Palevich | a8fecb8 | 2009-09-23 14:48:07 -0700 | [diff] [blame] | 165 | const GLushort quadIndices[] = { 0, 1, 2, 0, 2, 3 }; |
Jack Palevich | 8018f09 | 2009-09-30 06:14:24 -0700 | [diff] [blame] | 166 | glVertexPointer(3, GL_FLOAT, 0, vertices); |
Jack Palevich | a8fecb8 | 2009-09-23 14:48:07 -0700 | [diff] [blame] | 167 | glTexCoordPointer(2, GL_FIXED, 0, texCoords); |
| 168 | |
Jack Palevich | a8fecb8 | 2009-09-23 14:48:07 -0700 | [diff] [blame] | 169 | int nelem = sizeof(quadIndices)/sizeof(quadIndices[0]); |
| 170 | static float grey; |
| 171 | grey += 0.01f; |
| 172 | if (grey > 1.0f) { |
| 173 | grey = 0.0f; |
| 174 | } |
Jack Palevich | 8018f09 | 2009-09-30 06:14:24 -0700 | [diff] [blame] | 175 | glClearColor(background, grey, grey, 1.0f); |
Jack Palevich | a8fecb8 | 2009-09-23 14:48:07 -0700 | [diff] [blame] | 176 | glClear(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT); |
Jack Palevich | 8018f09 | 2009-09-30 06:14:24 -0700 | [diff] [blame] | 177 | glDrawElements(GL_TRIANGLES, nelem, GL_UNSIGNED_SHORT, quadIndices); |
| 178 | } |
Jack Palevich | a8fecb8 | 2009-09-23 14:48:07 -0700 | [diff] [blame] | 179 | |
Jack Palevich | 8018f09 | 2009-09-30 06:14:24 -0700 | [diff] [blame] | 180 | JNIEXPORT void JNICALL Java_com_android_gljni_GLJNILib_changeBackground(JNIEnv * env, jobject obj) |
| 181 | { |
| 182 | background = 1.0f - background; |
Jae-Hyung Ahn | f2c1d9e | 2009-11-30 17:30:21 +0900 | [diff] [blame] | 183 | } |