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loader functions moved to external file

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This commit is contained in:
Benjamin Petsch
2016-09-09 11:55:56 +02:00
parent 4f347a6ef5
commit 1b03cfe32b
6 changed files with 538 additions and 146 deletions
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BIN
opengl-test-two/bin/Debug/opengl-test-two.exe
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10
opengl-test-two/include/loaders.h Normal file
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@@ -0,0 +1,10 @@
#ifndef LOADERS_H
#define LOADERS_H
#define GLEW_STATIC
#include <GL/glew.h>
int InitLoaders();
GLuint LoadTexture(char *filename,int *textw,int *texth);
GLuint LoadShaders(const char * vertex_file_path,const char * fragment_file_path);
#endif // LOADERS_H

150
opengl-test-two/main.cpp
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@@ -4,151 +4,9 @@
#include <GL/glew.h> #include <GL/glew.h>
#include <GLFW/glfw3.h> #include <GLFW/glfw3.h>
#include <SDL2/SDL.h> #include <SDL2/SDL.h>
#include <SDL2/SDL_image.h>
#include <stdio.h>
#include <iostream>
#include <fstream> #include <fstream>
#include <vector>
#include <stdexcept> #include <stdexcept>
#include "loaders.h"
GLuint LoadTexture(char *filename,int *textw,int *texth) {
SDL_Surface *surface;
GLuint textureid;
int mode;
surface = IMG_Load(filename);
// Or if you don't use SDL_image you can use SDL_LoadBMP here instead:
// surface = SDL_LoadBMP(filename);
// could not load filename
if (!surface) {
return 0;
}
// work out what format to tell glTexImage2D to use...
if (surface->format->BytesPerPixel == 3) { // RGB 24bit
mode = GL_RGB;
} else if (surface->format->BytesPerPixel == 4) { // RGBA 32bit
mode = GL_RGBA;
} else {
SDL_FreeSurface(surface);
return 0;
}
*textw=surface->w;
*texth=surface->h;
// create one texture name
glGenTextures(1, &textureid);
// tell opengl to use the generated texture name
glBindTexture(GL_TEXTURE_2D, textureid);
// this reads from the sdl surface and puts it into an opengl texture
glTexImage2D(GL_TEXTURE_2D, 0, mode, surface->w, surface->h, 0, mode, GL_UNSIGNED_BYTE, surface->pixels);
// these affect how this texture is drawn later on...glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_S,GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_T,GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
// clean up
SDL_FreeSurface(surface);
return textureid;
}
GLuint LoadShaders(const char * vertex_file_path,const char * fragment_file_path){
// Create the shaders
GLuint VertexShaderID = glCreateShader(GL_VERTEX_SHADER);
GLuint FragmentShaderID = glCreateShader(GL_FRAGMENT_SHADER);
// Read the Vertex Shader code from the file
std::string VertexShaderCode;
std::ifstream VertexShaderStream(vertex_file_path, std::ios::in);
if(VertexShaderStream.is_open()){
std::string Line = "";
while(getline(VertexShaderStream, Line))
VertexShaderCode += "\n" + Line;
VertexShaderStream.close();
}else{
printf("Impossible to open %s. Are you in the right directory ? Don't forget to read the FAQ !\n", vertex_file_path);
getchar();
return 0;
}
// Read the Fragment Shader code from the file
std::string FragmentShaderCode;
std::ifstream FragmentShaderStream(fragment_file_path, std::ios::in);
if(FragmentShaderStream.is_open()){
std::string Line = "";
while(getline(FragmentShaderStream, Line))
FragmentShaderCode += "\n" + Line;
FragmentShaderStream.close();
}
GLint Result = GL_FALSE;
int InfoLogLength;
// Compile Vertex Shader
printf("Compiling shader : %s\n", vertex_file_path);
char const * VertexSourcePointer = VertexShaderCode.c_str();
glShaderSource(VertexShaderID, 1, &VertexSourcePointer , NULL);
glCompileShader(VertexShaderID);
// Check Vertex Shader
glGetShaderiv(VertexShaderID, GL_COMPILE_STATUS, &Result);
glGetShaderiv(VertexShaderID, GL_INFO_LOG_LENGTH, &InfoLogLength);
if ( InfoLogLength > 0 ){
std::vector<char> VertexShaderErrorMessage(InfoLogLength+1);
glGetShaderInfoLog(VertexShaderID, InfoLogLength, NULL, &VertexShaderErrorMessage[0]);
printf("%s\n", &VertexShaderErrorMessage[0]);
}
// Compile Fragment Shader
printf("Compiling shader : %s\n", fragment_file_path);
char const * FragmentSourcePointer = FragmentShaderCode.c_str();
glShaderSource(FragmentShaderID, 1, &FragmentSourcePointer , NULL);
glCompileShader(FragmentShaderID);
// Check Fragment Shader
glGetShaderiv(FragmentShaderID, GL_COMPILE_STATUS, &Result);
glGetShaderiv(FragmentShaderID, GL_INFO_LOG_LENGTH, &InfoLogLength);
if ( InfoLogLength > 0 ){
std::vector<char> FragmentShaderErrorMessage(InfoLogLength+1);
glGetShaderInfoLog(FragmentShaderID, InfoLogLength, NULL, &FragmentShaderErrorMessage[0]);
printf("%s\n", &FragmentShaderErrorMessage[0]);
}
// Link the program
printf("Linking program\n");
GLuint ProgramID = glCreateProgram();
glAttachShader(ProgramID, VertexShaderID);
glAttachShader(ProgramID, FragmentShaderID);
glLinkProgram(ProgramID);
// Check the program
glGetProgramiv(ProgramID, GL_LINK_STATUS, &Result);
glGetProgramiv(ProgramID, GL_INFO_LOG_LENGTH, &InfoLogLength);
if ( InfoLogLength > 0 ){
std::vector<char> ProgramErrorMessage(InfoLogLength+1);
glGetProgramInfoLog(ProgramID, InfoLogLength, NULL, &ProgramErrorMessage[0]);
printf("%s\n", &ProgramErrorMessage[0]);
}
glDetachShader(ProgramID, VertexShaderID);
glDetachShader(ProgramID, FragmentShaderID);
glDeleteShader(VertexShaderID);
glDeleteShader(FragmentShaderID);
return ProgramID;
}
int main(int argc, char* args[]) { int main(int argc, char* args[]) {
GLFWwindow* window; GLFWwindow* window;
@@ -179,16 +37,16 @@ int main(int argc, char* args[]) {
GLenum error = glGetError(); GLenum error = glGetError();
if (error != GL_NO_ERROR) if (error != GL_NO_ERROR)
{ {
std::cout << "OpenGL Error: " << error << std::endl; printf("OpenGL Error: %d",error);
} }
GLenum glewinit = glewInit(); GLenum glewinit = glewInit();
if (glewinit != GLEW_OK) { if (glewinit != GLEW_OK) {
std::cout << "Glew not okay! " << glewinit; printf("Glew not okay! %d",glewinit);
return 1; return 1;
} }
/* SDL */ /* SDL */
if (SDL_Init(SDL_INIT_VIDEO) < 0) { if (InitLoaders() < 0) {
printf("SDL Error"); printf("SDL Error");
return 1; return 1;
} }

4
opengl-test-two/opengl-test-two.cbp
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@@ -13,6 +13,7 @@
<Option compiler="gcc" /> <Option compiler="gcc" />
<Compiler> <Compiler>
<Add option="-g" /> <Add option="-g" />
<Add directory="include" />
</Compiler> </Compiler>
</Target> </Target>
<Target title="Release"> <Target title="Release">
@@ -22,6 +23,7 @@
<Option compiler="gcc" /> <Option compiler="gcc" />
<Compiler> <Compiler>
<Add option="-O2" /> <Add option="-O2" />
<Add directory="include" />
</Compiler> </Compiler>
<Linker> <Linker>
<Add option="-s" /> <Add option="-s" />
@@ -44,7 +46,9 @@
<Add library="SDL2_image" /> <Add library="SDL2_image" />
<Add directory="lib" /> <Add directory="lib" />
</Linker> </Linker>
<Unit filename="include/loaders.h" />
<Unit filename="main.cpp" /> <Unit filename="main.cpp" />
<Unit filename="src/loaders.cpp" />
<Unit filename="trimap.fragmentshader" /> <Unit filename="trimap.fragmentshader" />
<Unit filename="trimap.vertexshader" /> <Unit filename="trimap.vertexshader" />
<Extensions> <Extensions>

374
opengl-test-two/opengl-test-two.depend
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@@ -368,3 +368,377 @@
<OpenGL/glu.h> <OpenGL/glu.h>
<GL/glu.h> <GL/glu.h>
1473412967 source:d:\profile\ksy\eigene dateien\git\imanox-chroma-matting\opengl-test-two\main.cpp
<GL/glew.h>
<GLFW/glfw3.h>
<iostream>
<fstream>
<vector>
<stdexcept>
"loaders.h"
1473141855 d:\profile\ksy\eigene dateien\git\imanox-chroma-matting\opengl-test-two\include\gl\glew.h
<stddef.h>
<inttypes.h>
<stdint.h>
<inttypes.h>
<Availability.h>
<OpenGL/glu.h>
<GL/glu.h>
1473141855 d:\profile\ksy\eigene dateien\git\imanox-chroma-matting\opengl-test-two\include\glfw\glfw3.h
<stddef.h>
<stdint.h>
<OpenGL/gl3.h>
<OpenGL/gl3ext.h>
<OpenGL/gl.h>
<OpenGL/glu.h>
<GL/glcorearb.h>
<GLES/gl.h>
<GLES/glext.h>
<GLES2/gl2.h>
<GLES2/gl2ext.h>
<GLES3/gl3.h>
<GLES2/gl2ext.h>
<GLES3/gl31.h>
<GLES2/gl2ext.h>
<vulkan/vulkan.h>
<GL/gl.h>
<GL/glext.h>
<GL/glu.h>
1473141855 d:\profile\ksy\eigene dateien\git\imanox-chroma-matting\opengl-test-two\include\sdl2\sdl.h
"SDL_main.h"
"SDL_stdinc.h"
"SDL_assert.h"
"SDL_atomic.h"
"SDL_audio.h"
"SDL_clipboard.h"
"SDL_cpuinfo.h"
"SDL_endian.h"
"SDL_error.h"
"SDL_events.h"
"SDL_filesystem.h"
"SDL_joystick.h"
"SDL_gamecontroller.h"
"SDL_haptic.h"
"SDL_hints.h"
"SDL_loadso.h"
"SDL_log.h"
"SDL_messagebox.h"
"SDL_mutex.h"
"SDL_power.h"
"SDL_render.h"
"SDL_rwops.h"
"SDL_system.h"
"SDL_thread.h"
"SDL_timer.h"
"SDL_version.h"
"SDL_video.h"
"begin_code.h"
"close_code.h"
1473141855 d:\profile\ksy\eigene dateien\git\imanox-chroma-matting\opengl-test-two\include\sdl2\sdl_main.h
"SDL_stdinc.h"
"begin_code.h"
"close_code.h"
1473141855 d:\profile\ksy\eigene dateien\git\imanox-chroma-matting\opengl-test-two\include\sdl2\sdl_stdinc.h
"SDL_config.h"
<sys/types.h>
<stdio.h>
<stdlib.h>
<stddef.h>
<stdarg.h>
<stdlib.h>
<malloc.h>
<stddef.h>
<stdarg.h>
<memory.h>
<string.h>
<strings.h>
<inttypes.h>
<stdint.h>
<ctype.h>
<math.h>
<float.h>
<iconv.h>
<sal.h>
"begin_code.h"
<alloca.h>
<malloc.h>
<malloc.h>
<malloc.h>
<stdlib.h>
"close_code.h"
1473141855 d:\profile\ksy\eigene dateien\git\imanox-chroma-matting\opengl-test-two\include\sdl2\sdl_config.h
"SDL_platform.h"
1473141855 d:\profile\ksy\eigene dateien\git\imanox-chroma-matting\opengl-test-two\include\sdl2\sdl_platform.h
"AvailabilityMacros.h"
"TargetConditionals.h"
<winapifamily.h>
"begin_code.h"
"close_code.h"
1473141855 d:\profile\ksy\eigene dateien\git\imanox-chroma-matting\opengl-test-two\include\sdl2\begin_code.h
1473141855 d:\profile\ksy\eigene dateien\git\imanox-chroma-matting\opengl-test-two\include\sdl2\close_code.h
1473141855 d:\profile\ksy\eigene dateien\git\imanox-chroma-matting\opengl-test-two\include\sdl2\sdl_assert.h
"SDL_config.h"
"begin_code.h"
<signal.h>
"close_code.h"
1473141855 d:\profile\ksy\eigene dateien\git\imanox-chroma-matting\opengl-test-two\include\sdl2\sdl_atomic.h
"SDL_stdinc.h"
"SDL_platform.h"
"begin_code.h"
<mbarrier.h>
"close_code.h"
1473141855 d:\profile\ksy\eigene dateien\git\imanox-chroma-matting\opengl-test-two\include\sdl2\sdl_audio.h
"SDL_stdinc.h"
"SDL_error.h"
"SDL_endian.h"
"SDL_mutex.h"
"SDL_thread.h"
"SDL_rwops.h"
"begin_code.h"
"close_code.h"
1473141855 d:\profile\ksy\eigene dateien\git\imanox-chroma-matting\opengl-test-two\include\sdl2\sdl_error.h
"SDL_stdinc.h"
"begin_code.h"
"close_code.h"
1473141855 d:\profile\ksy\eigene dateien\git\imanox-chroma-matting\opengl-test-two\include\sdl2\sdl_endian.h
"SDL_stdinc.h"
<endian.h>
"begin_code.h"
"close_code.h"
1473141855 d:\profile\ksy\eigene dateien\git\imanox-chroma-matting\opengl-test-two\include\sdl2\sdl_mutex.h
"SDL_stdinc.h"
"SDL_error.h"
"begin_code.h"
"close_code.h"
1473141855 d:\profile\ksy\eigene dateien\git\imanox-chroma-matting\opengl-test-two\include\sdl2\sdl_thread.h
"SDL_stdinc.h"
"SDL_error.h"
"SDL_atomic.h"
"SDL_mutex.h"
"begin_code.h"
<process.h>
"close_code.h"
1473141855 d:\profile\ksy\eigene dateien\git\imanox-chroma-matting\opengl-test-two\include\sdl2\sdl_rwops.h
"SDL_stdinc.h"
"SDL_error.h"
"begin_code.h"
"close_code.h"
1473141855 d:\profile\ksy\eigene dateien\git\imanox-chroma-matting\opengl-test-two\include\sdl2\sdl_clipboard.h
"SDL_stdinc.h"
"begin_code.h"
"close_code.h"
1473141855 d:\profile\ksy\eigene dateien\git\imanox-chroma-matting\opengl-test-two\include\sdl2\sdl_cpuinfo.h
"SDL_stdinc.h"
<intrin.h>
<intrin.h>
<altivec.h>
<mmintrin.h>
<mm3dnow.h>
<xmmintrin.h>
<emmintrin.h>
"begin_code.h"
"close_code.h"
1473141855 d:\profile\ksy\eigene dateien\git\imanox-chroma-matting\opengl-test-two\include\sdl2\sdl_events.h
"SDL_stdinc.h"
"SDL_error.h"
"SDL_video.h"
"SDL_keyboard.h"
"SDL_mouse.h"
"SDL_joystick.h"
"SDL_gamecontroller.h"
"SDL_quit.h"
"SDL_gesture.h"
"SDL_touch.h"
"begin_code.h"
"close_code.h"
1473141855 d:\profile\ksy\eigene dateien\git\imanox-chroma-matting\opengl-test-two\include\sdl2\sdl_video.h
"SDL_stdinc.h"
"SDL_pixels.h"
"SDL_rect.h"
"SDL_surface.h"
"begin_code.h"
"close_code.h"
1473141855 d:\profile\ksy\eigene dateien\git\imanox-chroma-matting\opengl-test-two\include\sdl2\sdl_pixels.h
"SDL_stdinc.h"
"begin_code.h"
"close_code.h"
1473141855 d:\profile\ksy\eigene dateien\git\imanox-chroma-matting\opengl-test-two\include\sdl2\sdl_rect.h
"SDL_stdinc.h"
"SDL_error.h"
"SDL_pixels.h"
"SDL_rwops.h"
"begin_code.h"
"close_code.h"
1473141855 d:\profile\ksy\eigene dateien\git\imanox-chroma-matting\opengl-test-two\include\sdl2\sdl_surface.h
"SDL_stdinc.h"
"SDL_pixels.h"
"SDL_rect.h"
"SDL_blendmode.h"
"SDL_rwops.h"
"begin_code.h"
"close_code.h"
1473141855 d:\profile\ksy\eigene dateien\git\imanox-chroma-matting\opengl-test-two\include\sdl2\sdl_blendmode.h
"begin_code.h"
"close_code.h"
1473141855 d:\profile\ksy\eigene dateien\git\imanox-chroma-matting\opengl-test-two\include\sdl2\sdl_keyboard.h
"SDL_stdinc.h"
"SDL_error.h"
"SDL_keycode.h"
"SDL_video.h"
"begin_code.h"
"close_code.h"
1473141855 d:\profile\ksy\eigene dateien\git\imanox-chroma-matting\opengl-test-two\include\sdl2\sdl_keycode.h
"SDL_stdinc.h"
"SDL_scancode.h"
1473141855 d:\profile\ksy\eigene dateien\git\imanox-chroma-matting\opengl-test-two\include\sdl2\sdl_scancode.h
"SDL_stdinc.h"
1473141855 d:\profile\ksy\eigene dateien\git\imanox-chroma-matting\opengl-test-two\include\sdl2\sdl_mouse.h
"SDL_stdinc.h"
"SDL_error.h"
"SDL_video.h"
"begin_code.h"
"close_code.h"
1473141855 d:\profile\ksy\eigene dateien\git\imanox-chroma-matting\opengl-test-two\include\sdl2\sdl_joystick.h
"SDL_stdinc.h"
"SDL_error.h"
"begin_code.h"
"close_code.h"
1473141855 d:\profile\ksy\eigene dateien\git\imanox-chroma-matting\opengl-test-two\include\sdl2\sdl_gamecontroller.h
"SDL_stdinc.h"
"SDL_error.h"
"SDL_rwops.h"
"SDL_joystick.h"
"begin_code.h"
"close_code.h"
1473141855 d:\profile\ksy\eigene dateien\git\imanox-chroma-matting\opengl-test-two\include\sdl2\sdl_quit.h
"SDL_stdinc.h"
"SDL_error.h"
1473141855 d:\profile\ksy\eigene dateien\git\imanox-chroma-matting\opengl-test-two\include\sdl2\sdl_gesture.h
"SDL_stdinc.h"
"SDL_error.h"
"SDL_video.h"
"SDL_touch.h"
"begin_code.h"
"close_code.h"
1473141855 d:\profile\ksy\eigene dateien\git\imanox-chroma-matting\opengl-test-two\include\sdl2\sdl_touch.h
"SDL_stdinc.h"
"SDL_error.h"
"SDL_video.h"
"begin_code.h"
"close_code.h"
1473141855 d:\profile\ksy\eigene dateien\git\imanox-chroma-matting\opengl-test-two\include\sdl2\sdl_filesystem.h
"SDL_stdinc.h"
"begin_code.h"
"close_code.h"
1473141855 d:\profile\ksy\eigene dateien\git\imanox-chroma-matting\opengl-test-two\include\sdl2\sdl_haptic.h
"SDL_stdinc.h"
"SDL_error.h"
"SDL_joystick.h"
"begin_code.h"
"close_code.h"
1473141855 d:\profile\ksy\eigene dateien\git\imanox-chroma-matting\opengl-test-two\include\sdl2\sdl_hints.h
"SDL_stdinc.h"
"begin_code.h"
"close_code.h"
1473141855 d:\profile\ksy\eigene dateien\git\imanox-chroma-matting\opengl-test-two\include\sdl2\sdl_loadso.h
"SDL_stdinc.h"
"SDL_error.h"
"begin_code.h"
"close_code.h"
1473141855 d:\profile\ksy\eigene dateien\git\imanox-chroma-matting\opengl-test-two\include\sdl2\sdl_log.h
"SDL_stdinc.h"
"begin_code.h"
"close_code.h"
1473141855 d:\profile\ksy\eigene dateien\git\imanox-chroma-matting\opengl-test-two\include\sdl2\sdl_messagebox.h
"SDL_stdinc.h"
"SDL_video.h"
"begin_code.h"
"close_code.h"
1473141855 d:\profile\ksy\eigene dateien\git\imanox-chroma-matting\opengl-test-two\include\sdl2\sdl_power.h
"SDL_stdinc.h"
"begin_code.h"
"close_code.h"
1473141855 d:\profile\ksy\eigene dateien\git\imanox-chroma-matting\opengl-test-two\include\sdl2\sdl_render.h
"SDL_stdinc.h"
"SDL_rect.h"
"SDL_video.h"
"begin_code.h"
"close_code.h"
1473141855 d:\profile\ksy\eigene dateien\git\imanox-chroma-matting\opengl-test-two\include\sdl2\sdl_system.h
"SDL_stdinc.h"
"SDL_keyboard.h"
"SDL_render.h"
"SDL_video.h"
"begin_code.h"
"close_code.h"
1473141855 d:\profile\ksy\eigene dateien\git\imanox-chroma-matting\opengl-test-two\include\sdl2\sdl_timer.h
"SDL_stdinc.h"
"SDL_error.h"
"begin_code.h"
"close_code.h"
1473141855 d:\profile\ksy\eigene dateien\git\imanox-chroma-matting\opengl-test-two\include\sdl2\sdl_version.h
"SDL_stdinc.h"
"begin_code.h"
"close_code.h"
1473141855 d:\profile\ksy\eigene dateien\git\imanox-chroma-matting\opengl-test-two\include\sdl2\sdl_image.h
"SDL.h"
"SDL_version.h"
"begin_code.h"
"close_code.h"
1473412852 d:\profile\ksy\eigene dateien\git\imanox-chroma-matting\opengl-test-two\include\loaders.h
<GL/glew.h>
1473412967 source:d:\profile\ksy\eigene dateien\git\imanox-chroma-matting\opengl-test-two\src\loaders.cpp
<SDL2/SDL.h>
<SDL2/SDL_image.h>
<fstream>
<vector>
"loaders.h"

146
opengl-test-two/src/loaders.cpp Normal file
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@@ -0,0 +1,146 @@
#include <SDL2/SDL.h>
#include <SDL2/SDL_image.h>
#include <fstream>
#include <vector>
#include "loaders.h"
int InitLoaders(){
return SDL_Init(SDL_INIT_VIDEO);
}
GLuint LoadTexture(char *filename,int *textw,int *texth) {
SDL_Surface *surface;
GLuint textureid;
int mode;
surface = IMG_Load(filename);
// Or if you don't use SDL_image you can use SDL_LoadBMP here instead:
// surface = SDL_LoadBMP(filename);
// could not load filename
if (!surface) {
return 0;
}
// work out what format to tell glTexImage2D to use...
if (surface->format->BytesPerPixel == 3) { // RGB 24bit
mode = GL_RGB;
} else if (surface->format->BytesPerPixel == 4) { // RGBA 32bit
mode = GL_RGBA;
} else {
SDL_FreeSurface(surface);
return 0;
}
*textw=surface->w;
*texth=surface->h;
// create one texture name
glGenTextures(1, &textureid);
// tell opengl to use the generated texture name
glBindTexture(GL_TEXTURE_2D, textureid);
// this reads from the sdl surface and puts it into an opengl texture
glTexImage2D(GL_TEXTURE_2D, 0, mode, surface->w, surface->h, 0, mode, GL_UNSIGNED_BYTE, surface->pixels);
// these affect how this texture is drawn later on...glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_S,GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_T,GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
// clean up
SDL_FreeSurface(surface);
return textureid;
}
GLuint LoadShaders(const char * vertex_file_path,const char * fragment_file_path){
// Create the shaders
GLuint VertexShaderID = glCreateShader(GL_VERTEX_SHADER);
GLuint FragmentShaderID = glCreateShader(GL_FRAGMENT_SHADER);
// Read the Vertex Shader code from the file
std::string VertexShaderCode;
std::ifstream VertexShaderStream(vertex_file_path, std::ios::in);
if(VertexShaderStream.is_open()){
std::string Line = "";
while(getline(VertexShaderStream, Line))
VertexShaderCode += "\n" + Line;
VertexShaderStream.close();
}else{
printf("Impossible to open %s. Are you in the right directory ? Don't forget to read the FAQ !\n", vertex_file_path);
getchar();
return 0;
}
// Read the Fragment Shader code from the file
std::string FragmentShaderCode;
std::ifstream FragmentShaderStream(fragment_file_path, std::ios::in);
if(FragmentShaderStream.is_open()){
std::string Line = "";
while(getline(FragmentShaderStream, Line))
FragmentShaderCode += "\n" + Line;
FragmentShaderStream.close();
}
GLint Result = GL_FALSE;
int InfoLogLength;
// Compile Vertex Shader
printf("Compiling shader : %s\n", vertex_file_path);
char const * VertexSourcePointer = VertexShaderCode.c_str();
glShaderSource(VertexShaderID, 1, &VertexSourcePointer , NULL);
glCompileShader(VertexShaderID);
// Check Vertex Shader
glGetShaderiv(VertexShaderID, GL_COMPILE_STATUS, &Result);
glGetShaderiv(VertexShaderID, GL_INFO_LOG_LENGTH, &InfoLogLength);
if ( InfoLogLength > 0 ){
std::vector<char> VertexShaderErrorMessage(InfoLogLength+1);
glGetShaderInfoLog(VertexShaderID, InfoLogLength, NULL, &VertexShaderErrorMessage[0]);
printf("%s\n", &VertexShaderErrorMessage[0]);
}
// Compile Fragment Shader
printf("Compiling shader : %s\n", fragment_file_path);
char const * FragmentSourcePointer = FragmentShaderCode.c_str();
glShaderSource(FragmentShaderID, 1, &FragmentSourcePointer , NULL);
glCompileShader(FragmentShaderID);
// Check Fragment Shader
glGetShaderiv(FragmentShaderID, GL_COMPILE_STATUS, &Result);
glGetShaderiv(FragmentShaderID, GL_INFO_LOG_LENGTH, &InfoLogLength);
if ( InfoLogLength > 0 ){
std::vector<char> FragmentShaderErrorMessage(InfoLogLength+1);
glGetShaderInfoLog(FragmentShaderID, InfoLogLength, NULL, &FragmentShaderErrorMessage[0]);
printf("%s\n", &FragmentShaderErrorMessage[0]);
}
// Link the program
printf("Linking program\n");
GLuint ProgramID = glCreateProgram();
glAttachShader(ProgramID, VertexShaderID);
glAttachShader(ProgramID, FragmentShaderID);
glLinkProgram(ProgramID);
// Check the program
glGetProgramiv(ProgramID, GL_LINK_STATUS, &Result);
glGetProgramiv(ProgramID, GL_INFO_LOG_LENGTH, &InfoLogLength);
if ( InfoLogLength > 0 ){
std::vector<char> ProgramErrorMessage(InfoLogLength+1);
glGetProgramInfoLog(ProgramID, InfoLogLength, NULL, &ProgramErrorMessage[0]);
printf("%s\n", &ProgramErrorMessage[0]);
}
glDetachShader(ProgramID, VertexShaderID);
glDetachShader(ProgramID, FragmentShaderID);
glDeleteShader(VertexShaderID);
glDeleteShader(FragmentShaderID);
return ProgramID;
}