SDL: better GLES3 support, non-working GLES3 sample app
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pelya
274
project/jni/application/test-gles3/main.cpp
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274
project/jni/application/test-gles3/main.cpp
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#include <string>
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#include <vector>
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#include <SDL.h>
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#include <SDL_image.h>
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#include "esUtil.h"
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#ifdef __ANDROID__
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#include <android/log.h>
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#define printf(...) __android_log_print(ANDROID_LOG_INFO, "Test-GLES3", __VA_ARGS__)
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#endif
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int screenWidth = 0;
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int screenHeight = 0;
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GLuint drawTextureProgram = 0;
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GLint drawTextureSamplerLocation = 0;
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static void initSDL()
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{
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SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_JOYSTICK);
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SDL_EnableUNICODE(1);
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screenWidth = SDL_GetVideoInfo()->current_w;
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screenHeight = SDL_GetVideoInfo()->current_h;
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if ( ! SDL_SetVideoMode(screenWidth, screenHeight, 24, SDL_OPENGL|SDL_DOUBLEBUF|SDL_FULLSCREEN) )
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{
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printf("Couldn't set GL video mode: %s\n", SDL_GetError());
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SDL_Quit();
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exit(2);
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}
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SDL_WM_SetCaption("test", "test");
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}
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void loadShaders()
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{
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char vShaderStr[] =
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"#version 300 es \n"
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"precision mediump float; \n"
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"layout(location = 0) in vec4 a_position; \n"
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"layout(location = 1) in vec2 a_texCoord; \n"
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"out vec2 v_texCoord; \n"
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"void main() \n"
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"{ \n"
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" gl_Position = a_position; \n"
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" v_texCoord = a_texCoord; \n"
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"} \n";
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char fShaderStr[] =
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"#version 300 es \n"
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"precision mediump float; \n"
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"in vec2 v_texCoord; \n"
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"layout(location = 0) out vec4 outColor; \n"
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"uniform sampler2D s_texture; \n"
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"void main() \n"
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"{ \n"
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" outColor = texture( s_texture, v_texCoord ); \n"
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"} \n";
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// Load the shaders and get a linked program object
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drawTextureProgram = esLoadProgram ( vShaderStr, fShaderStr );
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// Get the sampler location
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drawTextureSamplerLocation = glGetUniformLocation ( drawTextureProgram, "s_texture" );
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}
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static void initGL()
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{
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glViewport(0, 0, screenWidth, screenHeight);
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glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
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glDisable(GL_DEPTH_TEST);
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glEnable(GL_BLEND);
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glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
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glActiveTexture ( GL_TEXTURE0 );
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loadShaders();
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}
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static void clearScreen()
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{
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glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT); // Always clear your scene before rendering, unless you're sure that you'll fill whole screen with textures/models etc
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}
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struct Sprite {
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Sprite(const char * path)
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{
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w = h = texture = 0;
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imagePath = path;
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loadTexture();
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}
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bool loadTexture()
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{
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SDL_Surface *pic;
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pic = IMG_Load(imagePath.c_str());
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if (!pic)
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{
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printf("Error: image %s cannot be loaded\n", imagePath.c_str());
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return false;
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}
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if (pic->format->BitsPerPixel != 32 && pic->format->BitsPerPixel != 24)
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{
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printf("Error: image %s is %dbpp - it should be either 24bpp or 32bpp, images with palette are not supported\n", imagePath.c_str(), pic->format->BitsPerPixel);
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SDL_FreeSurface(pic);
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return false;
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}
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GLenum glFormat = (pic->format->BitsPerPixel == 32 ? GL_RGBA : GL_RGB);
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w = pic->w;
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h = pic->h;
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// GLES3 always supports non-power-of-two textures, no need to recalculate texture dimensions
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glGenTextures(1, &texture);
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glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
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glTexImage2D(GL_TEXTURE_2D, 0, glFormat, w, h, 0, glFormat, GL_UNSIGNED_BYTE, pic->pixels);
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SDL_FreeSurface(pic);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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disableRepeat();
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return true;
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}
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void disableRepeat()
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{
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glBindTexture(GL_TEXTURE_2D, texture);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
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}
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void enableRepeat()
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{
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glBindTexture(GL_TEXTURE_2D, texture);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
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}
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void enableMirroredRepeat()
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{
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glBindTexture(GL_TEXTURE_2D, texture);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_MIRRORED_REPEAT);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_MIRRORED_REPEAT);
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}
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void draw(GLfloat x, GLfloat y, GLfloat width, GLfloat height, GLfloat tex_x1 = 0.0f, GLfloat tex_y1 = 0.0f, GLfloat tex_x2 = 1.0f, GLfloat tex_y2 = 1.0f)
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{
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if (texture == 0)
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return;
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glUseProgram( drawTextureProgram );
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GLfloat coords[] = {
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x, y, // Position 0
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tex_x1, tex_y1, // TexCoord 0
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x, y + width, // Position 1
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tex_x1, tex_y2, // TexCoord 1
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x + height, y + width, // Position 2
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tex_x2, tex_y2, // TexCoord 2
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x + height, y, // Position 3
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tex_x2, tex_y1 // TexCoord 3
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};
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// Load the vertex position
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glVertexAttribPointer( 0, 2, GL_FLOAT, GL_FALSE, 4 * sizeof ( GLfloat ), coords );
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// Load the texture coordinate
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glVertexAttribPointer( 1, 2, GL_FLOAT, GL_FALSE, 4 * sizeof ( GLfloat ), &coords[2] );
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glEnableVertexAttribArray( 0 );
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glEnableVertexAttribArray( 1 );
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glActiveTexture( GL_TEXTURE0 );
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glBindTexture( GL_TEXTURE_2D, texture );
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glUniform1i ( drawTextureSamplerLocation, 0 );
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glDrawArrays ( GL_TRIANGLE_FAN, 0, 4 );
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}
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void draw(GLfloat x, GLfloat y)
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{
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draw(x, y, w, h);
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}
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GLuint texture;
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int w, h;
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std::string imagePath;
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};
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int
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main(int argc, char *argv[])
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{
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initSDL();
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initGL();
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std::vector<Sprite> sprites;
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sprites.push_back(Sprite("test.png"));
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sprites.push_back(Sprite("element0.png"));
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sprites.push_back(Sprite("element1.png"));
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sprites.push_back(Sprite("element2.png"));
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sprites.push_back(Sprite("element3.png"));
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sprites.push_back(Sprite("stars.jpg"));
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sprites.back().enableMirroredRepeat(); // Looks nice
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int coords[][2] = { {0, 0},
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{200, 0},
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{300, 200},
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{400, 300} };
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float pulse = 1.0f, pulseChange = 0.01f;
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int anim = 1;
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while ( ! SDL_GetKeyState(NULL)[SDLK_ESCAPE] ) // Exit by pressing Back button
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{
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// clearScreen(); // Do not clear screen, we will fill the screens with tiled background image instead
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sprites[5].draw(0, 0, screenWidth, screenHeight, 0, 0, (float) screenWidth / sprites[5].w, (float) screenHeight / sprites[5].h);
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int mouseX = 0, mouseY = 0, buttons = 0;
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buttons = SDL_GetMouseState(&mouseX, &mouseY);
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sprites[0].draw(mouseX - sprites[0].w/2, mouseY - sprites[0].h/2);
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sprites[1].draw(coords[0][0], coords[0][1]);
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sprites[2].draw(coords[1][0], coords[1][1], sprites[2].w * pulse * 4, sprites[2].h * pulse * 4);
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sprites[3].draw(coords[2][0], coords[2][1], sprites[3].w * pulse * 4, sprites[3].h * 2);
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sprites[4].draw(coords[3][0], coords[3][1], sprites[4].w, sprites[4].h * pulse * 2);
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SDL_GL_SwapBuffers();
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SDL_Event event;
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while( SDL_PollEvent(&event) )
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{
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if(event.type == SDL_VIDEORESIZE)
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{
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// GL context was destroyed - reload all textures
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initGL();
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for(int i = 0; i < sprites.size(); i++)
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sprites[i].loadTexture();
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}
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if(event.type == SDL_KEYUP || event.type == SDL_KEYDOWN)
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{
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__android_log_print(ANDROID_LOG_INFO, "Hello", "SDL key event: evt %s state %s key %4d %12s scancode %4d mod %2d unicode %d", event.type == SDL_KEYUP ? "UP " : "DOWN" , event.key.state == SDL_PRESSED ? "PRESSED " : "RELEASED", (int)event.key.keysym.sym, SDL_GetKeyName(event.key.keysym.sym), (int)event.key.keysym.scancode, (int)event.key.keysym.mod, (int)event.key.keysym.unicode);
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if(event.key.keysym.sym == SDLK_ESCAPE)
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return 0;
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}
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}
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// Some kinda animation
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pulse += pulseChange;
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if(pulse >= 1.0f)
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pulseChange = -0.01f;
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if(pulse <= 0)
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pulseChange = 0.01f;
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for(int i = 0; i < 4; i++)
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{
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coords[i][0] += anim;
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coords[i][1] += anim;
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}
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if( coords[0][0] < 0 )
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anim = 1;
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if( coords[3][1] > screenHeight )
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anim = -1;
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}
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SDL_Quit();
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return 0;
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}
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