254 lines
8.2 KiB
C++
254 lines
8.2 KiB
C++
/*
|
|
* Copyright (C) 2009 The Android Open Source Project
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
// OpenGL ES 2.0 code
|
|
|
|
#include <SDL.h>
|
|
#include <android/log.h>
|
|
|
|
#include <GLES2/gl2.h>
|
|
#include <GLES2/gl2ext.h>
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <math.h>
|
|
|
|
#define LOG_TAG "libgl2jni"
|
|
#define LOGI(...) __android_log_print(ANDROID_LOG_INFO,LOG_TAG,__VA_ARGS__)
|
|
#define LOGE(...) __android_log_print(ANDROID_LOG_ERROR,LOG_TAG,__VA_ARGS__)
|
|
|
|
static void printGLString(const char *name, GLenum s) {
|
|
const char *v = (const char *) glGetString(s);
|
|
LOGI("GL %s = %s\n", name, v);
|
|
}
|
|
|
|
static void checkGlError(const char* op) {
|
|
for (GLint error = glGetError(); error; error
|
|
= glGetError()) {
|
|
LOGI("after %s() glError (0x%x)\n", op, error);
|
|
}
|
|
}
|
|
|
|
static const char gVertexShader[] =
|
|
"attribute vec4 vPosition;\n"
|
|
"void main() {\n"
|
|
" gl_Position = vPosition;\n"
|
|
"}\n";
|
|
|
|
static const char gFragmentShader[] =
|
|
"precision mediump float;\n"
|
|
"void main() {\n"
|
|
" gl_FragColor = vec4(0.0, 1.0, 0.0, 1.0);\n"
|
|
"}\n";
|
|
|
|
typedef GLuint (*tglCreateShader) (GLenum type);
|
|
tglCreateShader xglCreateShader;
|
|
typedef void (*tglDeleteShader) (GLuint shader);
|
|
tglDeleteShader xglDeleteShader;
|
|
typedef void (*tglShaderSource) (GLuint shader, GLsizei count, const char** string, const GLint* length);
|
|
tglShaderSource xglShaderSource;
|
|
typedef void (*tglCompileShader) (GLuint shader);
|
|
tglCompileShader xglCompileShader;
|
|
typedef void (*tglGetShaderiv) (GLuint shader, GLenum pname, GLint* params);
|
|
tglGetShaderiv xglGetShaderiv;
|
|
typedef void (*tglGetShaderInfoLog) (GLuint shader, GLsizei bufsize, GLsizei* length, char* infolog);
|
|
tglGetShaderInfoLog xglGetShaderInfoLog;
|
|
typedef GLuint (*tglCreateProgram) (void);
|
|
tglCreateProgram xglCreateProgram;
|
|
typedef void (*tglDeleteProgram) (GLuint program);
|
|
tglDeleteProgram xglDeleteProgram;
|
|
typedef void (*tglAttachShader) (GLuint program, GLuint shader);
|
|
tglAttachShader xglAttachShader;
|
|
typedef void (*tglLinkProgram) (GLuint program);
|
|
tglLinkProgram xglLinkProgram;
|
|
typedef void (*tglGetProgramiv) (GLuint program, GLenum pname, GLint* params);
|
|
tglGetProgramiv xglGetProgramiv;
|
|
typedef void (*tglGetProgramInfoLog) (GLuint program, GLsizei bufsize, GLsizei* length, char* infolog);
|
|
tglGetProgramInfoLog xglGetProgramInfoLog;
|
|
typedef int (*tglGetAttribLocation) (GLuint program, const char* name);
|
|
tglGetAttribLocation xglGetAttribLocation;
|
|
typedef void (*tglUseProgram) (GLuint program);
|
|
tglUseProgram xglUseProgram;
|
|
typedef void (*tglVertexAttribPointer) (GLuint indx, GLint size, GLenum type, GLboolean normalized, GLsizei stride, const void* ptr);
|
|
tglVertexAttribPointer xglVertexAttribPointer;
|
|
typedef void (*tglEnableVertexAttribArray) (GLuint index);
|
|
tglEnableVertexAttribArray xglEnableVertexAttribArray;
|
|
typedef void (*tglClearColor) (GLclampf red, GLclampf green, GLclampf blue, GLclampf alpha);
|
|
tglClearColor xglClearColor;
|
|
|
|
void loadFunctions(void)
|
|
{
|
|
SDL_GL_LoadLibrary(NULL);
|
|
#define GL_LOAD_PROC(name) GL_LOAD_PROC1(name)
|
|
#define GL_LOAD_PROC1(name) \
|
|
x ## name = (t ## name) SDL_GL_GetProcAddress( # name ); \
|
|
if( x ## name == NULL ) \
|
|
LOGE("Error loading GL function: %s", # name );
|
|
|
|
GL_LOAD_PROC(glCreateShader);
|
|
GL_LOAD_PROC(glDeleteShader);
|
|
GL_LOAD_PROC(glShaderSource);
|
|
GL_LOAD_PROC(glCompileShader);
|
|
GL_LOAD_PROC(glGetShaderiv);
|
|
GL_LOAD_PROC(glGetShaderInfoLog);
|
|
GL_LOAD_PROC(glCreateProgram);
|
|
GL_LOAD_PROC(glDeleteProgram);
|
|
GL_LOAD_PROC(glAttachShader);
|
|
GL_LOAD_PROC(glLinkProgram);
|
|
GL_LOAD_PROC(glGetProgramiv);
|
|
GL_LOAD_PROC(glGetProgramInfoLog);
|
|
GL_LOAD_PROC(glGetAttribLocation);
|
|
GL_LOAD_PROC(glUseProgram);
|
|
GL_LOAD_PROC(glVertexAttribPointer);
|
|
GL_LOAD_PROC(glEnableVertexAttribArray);
|
|
GL_LOAD_PROC(glClearColor);
|
|
}
|
|
|
|
GLuint loadShader(GLenum shaderType, const char* pSource) {
|
|
GLuint shader = xglCreateShader(shaderType);
|
|
checkGlError("glCreateShader");
|
|
if (shader) {
|
|
xglShaderSource(shader, 1, &pSource, NULL);
|
|
xglCompileShader(shader);
|
|
GLint compiled = 0;
|
|
xglGetShaderiv(shader, GL_COMPILE_STATUS, &compiled);
|
|
if (!compiled) {
|
|
GLint infoLen = 0;
|
|
xglGetShaderiv(shader, GL_INFO_LOG_LENGTH, &infoLen);
|
|
if (infoLen) {
|
|
char* buf = (char*) malloc(infoLen);
|
|
if (buf) {
|
|
xglGetShaderInfoLog(shader, infoLen, NULL, buf);
|
|
LOGE("Could not compile shader %d:\n%s\n",
|
|
shaderType, buf);
|
|
free(buf);
|
|
}
|
|
xglDeleteShader(shader);
|
|
shader = 0;
|
|
}
|
|
}
|
|
}
|
|
return shader;
|
|
}
|
|
|
|
GLuint createProgram(const char* pVertexSource, const char* pFragmentSource) {
|
|
GLuint vertexShader = loadShader(GL_VERTEX_SHADER, pVertexSource);
|
|
if (!vertexShader) {
|
|
return 0;
|
|
}
|
|
|
|
GLuint pixelShader = loadShader(GL_FRAGMENT_SHADER, pFragmentSource);
|
|
if (!pixelShader) {
|
|
return 0;
|
|
}
|
|
|
|
GLuint program = xglCreateProgram();
|
|
checkGlError("glCreateProgram");
|
|
if (program) {
|
|
xglAttachShader(program, vertexShader);
|
|
checkGlError("glAttachShader");
|
|
xglAttachShader(program, pixelShader);
|
|
checkGlError("glAttachShader");
|
|
xglLinkProgram(program);
|
|
GLint linkStatus = GL_FALSE;
|
|
xglGetProgramiv(program, GL_LINK_STATUS, &linkStatus);
|
|
if (linkStatus != GL_TRUE) {
|
|
GLint bufLength = 0;
|
|
xglGetProgramiv(program, GL_INFO_LOG_LENGTH, &bufLength);
|
|
if (bufLength) {
|
|
char* buf = (char*) malloc(bufLength);
|
|
if (buf) {
|
|
xglGetProgramInfoLog(program, bufLength, NULL, buf);
|
|
LOGE("Could not link program:\n%s\n", buf);
|
|
free(buf);
|
|
}
|
|
}
|
|
xglDeleteProgram(program);
|
|
program = 0;
|
|
}
|
|
}
|
|
return program;
|
|
}
|
|
|
|
GLuint gProgram;
|
|
GLuint gvPositionHandle;
|
|
|
|
bool setupGraphics(int w, int h) {
|
|
printGLString("Version", GL_VERSION);
|
|
printGLString("Vendor", GL_VENDOR);
|
|
printGLString("Renderer", GL_RENDERER);
|
|
printGLString("Extensions", GL_EXTENSIONS);
|
|
loadFunctions();
|
|
|
|
LOGI("setupGraphics(%d, %d)", w, h);
|
|
gProgram = createProgram(gVertexShader, gFragmentShader);
|
|
if (!gProgram) {
|
|
LOGE("Could not create program.");
|
|
return false;
|
|
}
|
|
gvPositionHandle = xglGetAttribLocation(gProgram, "vPosition");
|
|
checkGlError("glGetAttribLocation");
|
|
LOGI("glGetAttribLocation(\"vPosition\") = %d\n",
|
|
gvPositionHandle);
|
|
|
|
glViewport(0, 0, w, h);
|
|
checkGlError("glViewport");
|
|
return true;
|
|
}
|
|
|
|
const GLfloat gTriangleVertices[] = { 0.0f, 0.5f, -0.5f, -0.5f,
|
|
0.5f, -0.5f };
|
|
|
|
void renderFrame() {
|
|
static float grey;
|
|
grey += 0.01f;
|
|
if (grey > 1.0f) {
|
|
grey = 0.0f;
|
|
}
|
|
xglClearColor(grey, grey, grey, 1.0f);
|
|
checkGlError("glClearColor");
|
|
glClear(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT);
|
|
checkGlError("glClear");
|
|
|
|
xglUseProgram(gProgram);
|
|
checkGlError("glUseProgram");
|
|
|
|
xglVertexAttribPointer(gvPositionHandle, 2, GL_FLOAT, GL_FALSE, 0, gTriangleVertices);
|
|
checkGlError("glVertexAttribPointer");
|
|
xglEnableVertexAttribArray(gvPositionHandle);
|
|
checkGlError("glEnableVertexAttribArray");
|
|
glDrawArrays(GL_TRIANGLES, 0, 3);
|
|
checkGlError("glDrawArrays");
|
|
}
|
|
|
|
int SDL_main(int argc, char ** argv)
|
|
{
|
|
int SCREEN_W = 640;
|
|
int SCREEN_H = 480;
|
|
SDL_Init(SDL_INIT_VIDEO);
|
|
SDL_SetVideoMode(SCREEN_W, SCREEN_H, 24, SDL_OPENGL | SDL_DOUBLEBUF);
|
|
setupGraphics(SCREEN_W, SCREEN_H);
|
|
while( ! SDL_GetKeyState(NULL)[SDLK_ESCAPE] )
|
|
{
|
|
SDL_Event evt;
|
|
renderFrame();
|
|
SDL_GL_SwapBuffers();
|
|
while( SDL_PollEvent(&evt) )
|
|
{
|
|
}
|
|
}
|
|
}
|