Better Windows and Linux compatibility

Makefile

@@ -47,6 +47,7 @@ SDL_LDFLAGS := -lSDL2 -lGL
 ifeq ($(PLATFORM),windows32)
 CFLAGS += -IWindows
 LDFLAGS += -lmsvcrt -lSDL2main -Wl,/MANIFESTFILE:NUL
+SDL_LDFLAGS := -lSDL2 -lopengl32
 else
 LDFLAGS += -lc -lm
 endif

SDL/opengl_compat.c

@@ -0,0 +1,34 @@
+#define GL_GLEXT_PROTOTYPES
+#include <SDL2/SDL_opengl.h>
+
+#ifndef __APPLE__
+#define GL_COMPAT_NAME(func) gl_compat_##func
+#define GL_COMPAT_VAR(func) typeof(func) *GL_COMPAT_NAME(func)
+
+GL_COMPAT_VAR(glCreateShader);
+GL_COMPAT_VAR(glGetAttribLocation);
+GL_COMPAT_VAR(glGetUniformLocation);
+GL_COMPAT_VAR(glUseProgram);
+GL_COMPAT_VAR(glGenVertexArrays);
+GL_COMPAT_VAR(glBindVertexArray);
+GL_COMPAT_VAR(glGenBuffers);
+GL_COMPAT_VAR(glBindBuffer);
+GL_COMPAT_VAR(glBufferData);
+GL_COMPAT_VAR(glEnableVertexAttribArray);
+GL_COMPAT_VAR(glVertexAttribPointer);
+GL_COMPAT_VAR(glCreateProgram);
+GL_COMPAT_VAR(glAttachShader);
+GL_COMPAT_VAR(glLinkProgram);
+GL_COMPAT_VAR(glGetProgramiv);
+GL_COMPAT_VAR(glGetProgramInfoLog);
+GL_COMPAT_VAR(glDeleteShader);
+GL_COMPAT_VAR(glUniform2f);
+GL_COMPAT_VAR(glActiveTexture);
+GL_COMPAT_VAR(glUniform1i);
+GL_COMPAT_VAR(glBindFragDataLocation);
+GL_COMPAT_VAR(glDeleteProgram);
+GL_COMPAT_VAR(glShaderSource);
+GL_COMPAT_VAR(glCompileShader);
+GL_COMPAT_VAR(glGetShaderiv);
+GL_COMPAT_VAR(glGetShaderInfoLog);
+#endif

SDL/opengl_compat.h

@@ -0,0 +1,45 @@
+#ifndef opengl_compat_h
+#define opengl_compat_h
+
+#define GL_GLEXT_PROTOTYPES
+#include <SDL2/SDL_opengl.h>
+#include <SDL2/SDL_video.h>
+
+#ifndef __APPLE__
+#define GL_COMPAT_NAME(func) gl_compat_##func
+
+#define GL_COMPAT_WRAPPER(func) \
+({  extern typeof(func) *GL_COMPAT_NAME(func); \
+if(!GL_COMPAT_NAME(func)) GL_COMPAT_NAME(func) = SDL_GL_GetProcAddress(#func); \
+    GL_COMPAT_NAME(func); \
+})
+
+#define glCreateShader GL_COMPAT_WRAPPER(glCreateShader)
+#define glGetAttribLocation GL_COMPAT_WRAPPER(glGetAttribLocation)
+#define glGetUniformLocation GL_COMPAT_WRAPPER(glGetUniformLocation)
+#define glUseProgram GL_COMPAT_WRAPPER(glUseProgram)
+#define glGenVertexArrays GL_COMPAT_WRAPPER(glGenVertexArrays)
+#define glBindVertexArray GL_COMPAT_WRAPPER(glBindVertexArray)
+#define glGenBuffers GL_COMPAT_WRAPPER(glGenBuffers)
+#define glBindBuffer GL_COMPAT_WRAPPER(glBindBuffer)
+#define glBufferData GL_COMPAT_WRAPPER(glBufferData)
+#define glEnableVertexAttribArray GL_COMPAT_WRAPPER(glEnableVertexAttribArray)
+#define glVertexAttribPointer GL_COMPAT_WRAPPER(glVertexAttribPointer)
+#define glCreateProgram GL_COMPAT_WRAPPER(glCreateProgram)
+#define glAttachShader GL_COMPAT_WRAPPER(glAttachShader)
+#define glLinkProgram GL_COMPAT_WRAPPER(glLinkProgram)
+#define glGetProgramiv GL_COMPAT_WRAPPER(glGetProgramiv)
+#define glGetProgramInfoLog GL_COMPAT_WRAPPER(glGetProgramInfoLog)
+#define glDeleteShader GL_COMPAT_WRAPPER(glDeleteShader)
+#define glUniform2f GL_COMPAT_WRAPPER(glUniform2f)
+#define glActiveTexture GL_COMPAT_WRAPPER(glActiveTexture)
+#define glUniform1i GL_COMPAT_WRAPPER(glUniform1i)
+#define glBindFragDataLocation GL_COMPAT_WRAPPER(glBindFragDataLocation)
+#define glDeleteProgram GL_COMPAT_WRAPPER(glDeleteProgram)
+#define glShaderSource GL_COMPAT_WRAPPER(glShaderSource)
+#define glCompileShader GL_COMPAT_WRAPPER(glCompileShader)
+#define glGetShaderiv GL_COMPAT_WRAPPER(glGetShaderiv)
+#define glGetShaderInfoLog GL_COMPAT_WRAPPER(glGetShaderInfoLog)
+#endif
+
+#endif /* opengl_compat_h */

SDL/shader.c

@@ -75,7 +75,7 @@ bool init_shader_with_name(shader_t *shader, const char *name)
     static char master_shader_code[0x801] = {0,};
     static char shader_code[0x10001] = {0,};
     static char final_shader_code[0x10801] = {0,};
-    static ssize_t filter_token_location = 0;
+    static signed long filter_token_location = 0;
     
     if (!master_shader_code[0]) {
         FILE *master_shader_f = fopen(executable_relative_path("Shaders/MasterShader.fsh"), "r");

SDL/shader.h

@@ -1,7 +1,6 @@
 #ifndef shader_h
 #define shader_h
-#define GL_GLEXT_PROTOTYPES
+#include "opengl_compat.h"
-#include <SDL2/SDL_opengl.h>
 #include <stdbool.h>
 
 typedef struct shader_s {

Windows/inttypes.h

@@ -0,0 +1 @@
+#include <stdint.h>