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feat(shaders_lab): add gl_loader + Windows cross-compile

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- cpp/functions/gfx/gl_loader.{h,cpp,md}: mini loader para OpenGL 2.0+
  (Linux no-op via GL_GLEXT_PROTOTYPES, Windows wglGetProcAddress)
- Portar gl_shader/gl_framebuffer/fullscreen_quad/shader_canvas al loader
- CMakeLists: WIN32_EXECUTABLE para lanzar sin consola en Windows
- apps/shaders_lab/shaders_lab.exe: binario PE32+ precompilado

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
Egutierrez
2026-04-24 20:52:37 +02:00
parent 3008b56e76
commit 9b1ca41c4d
11 changed files with 313 additions and 52 deletions
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cpp/functions/gfx/gl_loader.h
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#pragma once
#ifdef _WIN32
#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif
#include <windows.h>
#include <GL/gl.h>
#include <GL/glext.h>
extern PFNGLATTACHSHADERPROC fn_glAttachShader;
extern PFNGLBINDBUFFERPROC fn_glBindBuffer;
extern PFNGLBINDFRAMEBUFFERPROC fn_glBindFramebuffer;
extern PFNGLBINDVERTEXARRAYPROC fn_glBindVertexArray;
extern PFNGLCOMPILESHADERPROC fn_glCompileShader;
extern PFNGLCREATEPROGRAMPROC fn_glCreateProgram;
extern PFNGLCREATESHADERPROC fn_glCreateShader;
extern PFNGLDELETEBUFFERSPROC fn_glDeleteBuffers;
extern PFNGLDELETEFRAMEBUFFERSPROC fn_glDeleteFramebuffers;
extern PFNGLDELETEPROGRAMPROC fn_glDeleteProgram;
extern PFNGLDELETESHADERPROC fn_glDeleteShader;
extern PFNGLDELETEVERTEXARRAYSPROC fn_glDeleteVertexArrays;
extern PFNGLFRAMEBUFFERTEXTURE2DPROC fn_glFramebufferTexture2D;
extern PFNGLGENBUFFERSPROC fn_glGenBuffers;
extern PFNGLGENFRAMEBUFFERSPROC fn_glGenFramebuffers;
extern PFNGLGENVERTEXARRAYSPROC fn_glGenVertexArrays;
extern PFNGLGETPROGRAMINFOLOGPROC fn_glGetProgramInfoLog;
extern PFNGLGETPROGRAMIVPROC fn_glGetProgramiv;
extern PFNGLGETSHADERINFOLOGPROC fn_glGetShaderInfoLog;
extern PFNGLGETSHADERIVPROC fn_glGetShaderiv;
extern PFNGLGETUNIFORMLOCATIONPROC fn_glGetUniformLocation;
extern PFNGLLINKPROGRAMPROC fn_glLinkProgram;
extern PFNGLSHADERSOURCEPROC fn_glShaderSource;
extern PFNGLUNIFORM1FPROC fn_glUniform1f;
extern PFNGLUNIFORM2FPROC fn_glUniform2f;
extern PFNGLUSEPROGRAMPROC fn_glUseProgram;
#define glAttachShader fn_glAttachShader
#define glBindBuffer fn_glBindBuffer
#define glBindFramebuffer fn_glBindFramebuffer
#define glBindVertexArray fn_glBindVertexArray
#define glCompileShader fn_glCompileShader
#define glCreateProgram fn_glCreateProgram
#define glCreateShader fn_glCreateShader
#define glDeleteBuffers fn_glDeleteBuffers
#define glDeleteFramebuffers fn_glDeleteFramebuffers
#define glDeleteProgram fn_glDeleteProgram
#define glDeleteShader fn_glDeleteShader
#define glDeleteVertexArrays fn_glDeleteVertexArrays
#define glFramebufferTexture2D fn_glFramebufferTexture2D
#define glGenBuffers fn_glGenBuffers
#define glGenFramebuffers fn_glGenFramebuffers
#define glGenVertexArrays fn_glGenVertexArrays
#define glGetProgramInfoLog fn_glGetProgramInfoLog
#define glGetProgramiv fn_glGetProgramiv
#define glGetShaderInfoLog fn_glGetShaderInfoLog
#define glGetShaderiv fn_glGetShaderiv
#define glGetUniformLocation fn_glGetUniformLocation
#define glLinkProgram fn_glLinkProgram
#define glShaderSource fn_glShaderSource
#define glUniform1f fn_glUniform1f
#define glUniform2f fn_glUniform2f
#define glUseProgram fn_glUseProgram
#else
#define GL_GLEXT_PROTOTYPES
#include <GL/gl.h>
#include <GL/glext.h>
#endif
namespace fn::gfx {
// Load OpenGL 2.0+ function pointers. On Linux it's a no-op (symbols resolved
// statically via GL_GLEXT_PROTOTYPES). On Windows it uses wglGetProcAddress;
// the GL context must be current before calling.
bool gl_loader_init();
} // namespace fn::gfx