ref: 13d1463112e7088e4d289d536d913c48b3962ab9
parent: cb2a1eded3f7048f05615b0981b8eb17d7ed23e4
author: vanfanel <redwindwanderer@gmail.com>
date: Tue Aug 15 08:37:01 EDT 2023
Add modern GLVND and explicit GLES2 support in GNU/Linux
--- a/Makefile
+++ b/Makefile
@@ -2,6 +2,7 @@
EMCC ?= emcc
UNAME_S := $(shell uname -s)
RENDERER ?= GL
+USE_GLX ?= false
DEBUG ?= false
L_FLAGS ?= -lm -rdynamic
@@ -23,6 +24,9 @@
$(error Unknown RENDERER)
endif
+ifeq ($(GL_VERSION), GLES2)
+ C_FLAGS := $(C_FLAGS) -DUSE_GLES2
+endif
@@ -44,7 +48,14 @@
else ifeq ($(UNAME_S), Linux)
ifeq ($(RENDERER), GL)
- L_FLAGS := $(L_FLAGS) -lGLEW -lGL
+ L_FLAGS := $(L_FLAGS) -lGLEW
+
+ # Prefer modern GLVND instead of legacy X11-only GLX
+ ifeq ($(USE_GLX), true)
+ L_FLAGS := $(L_FLAGS) -lGL
+ else
+ L_FLAGS := $(L_FLAGS) -lOpenGL
+ endif
endif
L_FLAGS_SDL = -lSDL2
--- a/src/platform_sdl.c
+++ b/src/platform_sdl.c
@@ -219,6 +219,12 @@
SDL_GLContext platform_gl;
void platform_video_init() {+ #if defined(USE_GLES2)
+ SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_ES);
+ SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 2);
+ SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 1);
+ #endif
+
platform_gl = SDL_GL_CreateContext(window);
SDL_GL_SetSwapInterval(1);
}
--- a/src/render_gl.c
+++ b/src/render_gl.c
@@ -55,7 +55,7 @@
#define TEXTURES_MAX 1024
-#ifdef __EMSCRIPTEN__
+#if defined(__EMSCRIPTEN__) || defined(USE_GLES2)
// WebGL (GLES) needs the `precision` to be set, wheras OpenGL 2
// doesn't like that...
#define SHADER_SOURCE(...) "precision highp float;" #__VA_ARGS__