Jack Palevich | a8fecb8 | 2009-09-23 14:48:07 -0700 | [diff] [blame] | 1 | // OpenGL ES 2.0 code |
| 2 | |
| 3 | #include <nativehelper/jni.h> |
| 4 | #define LOG_TAG "GL2JNI gl_code.cpp" |
| 5 | #include <utils/Log.h> |
Jack Palevich | aa3b0be | 2009-09-25 19:07:31 -0700 | [diff] [blame] | 6 | |
Jack Palevich | a8fecb8 | 2009-09-23 14:48:07 -0700 | [diff] [blame] | 7 | #include <EGL/egl.h> |
| 8 | #include <GLES2/gl2.h> |
| 9 | #include <GLES2/gl2ext.h> |
| 10 | |
Jack Palevich | aa3b0be | 2009-09-25 19:07:31 -0700 | [diff] [blame] | 11 | #include <stdio.h> |
Jack Palevich | a8fecb8 | 2009-09-23 14:48:07 -0700 | [diff] [blame] | 12 | #include <stdlib.h> |
| 13 | #include <math.h> |
| 14 | |
| 15 | static void printGLString(const char *name, GLenum s) { |
| 16 | const char *v = (const char *) glGetString(s); |
Steve Block | 6215d3f | 2012-01-04 20:05:49 +0000 | [diff] [blame] | 17 | ALOGI("GL %s = %s\n", name, v); |
Jack Palevich | a8fecb8 | 2009-09-23 14:48:07 -0700 | [diff] [blame] | 18 | } |
| 19 | |
| 20 | static void checkGlError(const char* op) { |
| 21 | for (GLint error = glGetError(); error; error |
| 22 | = glGetError()) { |
Steve Block | 6215d3f | 2012-01-04 20:05:49 +0000 | [diff] [blame] | 23 | ALOGI("after %s() glError (0x%x)\n", op, error); |
Jack Palevich | a8fecb8 | 2009-09-23 14:48:07 -0700 | [diff] [blame] | 24 | } |
| 25 | } |
Jack Palevich | aa3b0be | 2009-09-25 19:07:31 -0700 | [diff] [blame] | 26 | |
Jack Palevich | a8fecb8 | 2009-09-23 14:48:07 -0700 | [diff] [blame] | 27 | static const char gVertexShader[] = "attribute vec4 vPosition;\n" |
| 28 | "void main() {\n" |
| 29 | " gl_Position = vPosition;\n" |
| 30 | "}\n"; |
| 31 | |
| 32 | static const char gFragmentShader[] = "precision mediump float;\n" |
| 33 | "void main() {\n" |
| 34 | " gl_FragColor = vec4(0.0, 1.0, 0.0, 1.0);\n" |
| 35 | "}\n"; |
| 36 | |
| 37 | GLuint loadShader(GLenum shaderType, const char* pSource) { |
| 38 | GLuint shader = glCreateShader(shaderType); |
| 39 | if (shader) { |
| 40 | glShaderSource(shader, 1, &pSource, NULL); |
| 41 | glCompileShader(shader); |
| 42 | GLint compiled = 0; |
| 43 | glGetShaderiv(shader, GL_COMPILE_STATUS, &compiled); |
| 44 | if (!compiled) { |
| 45 | GLint infoLen = 0; |
| 46 | glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &infoLen); |
| 47 | if (infoLen) { |
| 48 | char* buf = (char*) malloc(infoLen); |
| 49 | if (buf) { |
| 50 | glGetShaderInfoLog(shader, infoLen, NULL, buf); |
| 51 | LOGE("Could not compile shader %d:\n%s\n", |
| 52 | shaderType, buf); |
| 53 | free(buf); |
| 54 | } |
| 55 | glDeleteShader(shader); |
| 56 | shader = 0; |
| 57 | } |
| 58 | } |
| 59 | } |
| 60 | return shader; |
| 61 | } |
| 62 | |
| 63 | GLuint createProgram(const char* pVertexSource, const char* pFragmentSource) { |
| 64 | GLuint vertexShader = loadShader(GL_VERTEX_SHADER, pVertexSource); |
| 65 | if (!vertexShader) { |
| 66 | return 0; |
| 67 | } |
| 68 | |
| 69 | GLuint pixelShader = loadShader(GL_FRAGMENT_SHADER, pFragmentSource); |
| 70 | if (!pixelShader) { |
| 71 | return 0; |
| 72 | } |
| 73 | |
| 74 | GLuint program = glCreateProgram(); |
| 75 | if (program) { |
| 76 | glAttachShader(program, vertexShader); |
| 77 | checkGlError("glAttachShader"); |
| 78 | glAttachShader(program, pixelShader); |
| 79 | checkGlError("glAttachShader"); |
| 80 | glLinkProgram(program); |
| 81 | GLint linkStatus = GL_FALSE; |
| 82 | glGetProgramiv(program, GL_LINK_STATUS, &linkStatus); |
| 83 | if (linkStatus != GL_TRUE) { |
| 84 | GLint bufLength = 0; |
| 85 | glGetProgramiv(program, GL_INFO_LOG_LENGTH, &bufLength); |
| 86 | if (bufLength) { |
| 87 | char* buf = (char*) malloc(bufLength); |
| 88 | if (buf) { |
| 89 | glGetProgramInfoLog(program, bufLength, NULL, buf); |
| 90 | LOGE("Could not link program:\n%s\n", buf); |
| 91 | free(buf); |
| 92 | } |
| 93 | } |
| 94 | glDeleteProgram(program); |
| 95 | program = 0; |
| 96 | } |
| 97 | } |
| 98 | return program; |
| 99 | } |
| 100 | |
| 101 | GLuint gProgram; |
| 102 | GLuint gvPositionHandle; |
| 103 | |
| 104 | bool setupGraphics(int w, int h) { |
| 105 | printGLString("Version", GL_VERSION); |
| 106 | printGLString("Vendor", GL_VENDOR); |
| 107 | printGLString("Renderer", GL_RENDERER); |
| 108 | printGLString("Extensions", GL_EXTENSIONS); |
| 109 | |
Steve Block | 6215d3f | 2012-01-04 20:05:49 +0000 | [diff] [blame] | 110 | ALOGI("setupGraphics(%d, %d)", w, h); |
Jack Palevich | a8fecb8 | 2009-09-23 14:48:07 -0700 | [diff] [blame] | 111 | gProgram = createProgram(gVertexShader, gFragmentShader); |
| 112 | if (!gProgram) { |
| 113 | LOGE("Could not create program."); |
| 114 | return false; |
| 115 | } |
| 116 | gvPositionHandle = glGetAttribLocation(gProgram, "vPosition"); |
| 117 | checkGlError("glGetAttribLocation"); |
Steve Block | 6215d3f | 2012-01-04 20:05:49 +0000 | [diff] [blame] | 118 | ALOGI("glGetAttribLocation(\"vPosition\") = %d\n", |
Jack Palevich | a8fecb8 | 2009-09-23 14:48:07 -0700 | [diff] [blame] | 119 | gvPositionHandle); |
| 120 | |
| 121 | glViewport(0, 0, w, h); |
| 122 | checkGlError("glViewport"); |
| 123 | return true; |
| 124 | } |
| 125 | |
| 126 | const GLfloat gTriangleVertices[] = { 0.0f, 0.5f, -0.5f, -0.5f, |
| 127 | 0.5f, -0.5f }; |
| 128 | |
| 129 | void renderFrame() { |
| 130 | static float grey; |
| 131 | grey += 0.01f; |
| 132 | if (grey > 1.0f) { |
| 133 | grey = 0.0f; |
| 134 | } |
| 135 | glClearColor(grey, grey, grey, 1.0f); |
| 136 | checkGlError("glClearColor"); |
| 137 | glClear( GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT); |
| 138 | checkGlError("glClear"); |
| 139 | |
| 140 | glUseProgram(gProgram); |
| 141 | checkGlError("glUseProgram"); |
| 142 | |
| 143 | glVertexAttribPointer(gvPositionHandle, 2, GL_FLOAT, GL_FALSE, 0, gTriangleVertices); |
| 144 | checkGlError("glVertexAttribPointer"); |
| 145 | glEnableVertexAttribArray(gvPositionHandle); |
| 146 | checkGlError("glEnableVertexAttribArray"); |
| 147 | glDrawArrays(GL_TRIANGLES, 0, 3); |
| 148 | checkGlError("glDrawArrays"); |
| 149 | } |
| 150 | |
| 151 | extern "C" { |
| 152 | JNIEXPORT void JNICALL Java_com_android_gl2jni_GL2JNILib_init(JNIEnv * env, jobject obj, jint width, jint height); |
| 153 | JNIEXPORT void JNICALL Java_com_android_gl2jni_GL2JNILib_step(JNIEnv * env, jobject obj); |
Jack Palevich | aa3b0be | 2009-09-25 19:07:31 -0700 | [diff] [blame] | 154 | }; |
Jack Palevich | a8fecb8 | 2009-09-23 14:48:07 -0700 | [diff] [blame] | 155 | |
Jack Palevich | aa3b0be | 2009-09-25 19:07:31 -0700 | [diff] [blame] | 156 | JNIEXPORT void JNICALL Java_com_android_gl2jni_GL2JNILib_init(JNIEnv * env, jobject obj, jint width, jint height)
|
| 157 | { |
| 158 | setupGraphics(width, height); |
| 159 | } |
| 160 | |
| 161 | JNIEXPORT void JNICALL Java_com_android_gl2jni_GL2JNILib_step(JNIEnv * env, jobject obj) |
| 162 | { |
| 163 | renderFrame(); |
| 164 | } |
Jack Palevich | a8fecb8 | 2009-09-23 14:48:07 -0700 | [diff] [blame] | 165 | |