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OpenGL ES 2.0 rendering #223

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OpenGL ES 2.0 rendering #223

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dfc21e5
get OpenGL ES 2.0 off the ground
cobaltgit Jun 12, 2026
32ea326
fix desktop/web builds
cobaltgit Jun 12, 2026
168af8c
check for VAOs at runtime
cobaltgit Jun 12, 2026
d925dde
fix the web build...again
cobaltgit Jun 12, 2026
5a59cdb
make shdr compile GLES shaders on GLES2
cobaltgit Jun 12, 2026
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6 changes: 6 additions & 0 deletions CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -93,6 +93,12 @@ endif()
# Platform specific files builds
file(GLOB PLATFORM_SOURCES src/${PLATFORM}/*.c)

# OpenGL ES 2.0 / WebGL2 compatibility
option(ENABLE_GLES2 "Build the gl_renderer against OpenGL ES 2.0 / WebGL 1.0 instead of desktop GL 4.1 Core" OFF)
if (ENABLE_GLES2 AND ENABLE_LEGACY_GL)
set(ENABLE_LEGACY_GL OFF)
endif()

# OpenGL ES 3.0 / WebGL2 compatibility
option(ENABLE_GLES "Build the gl_renderer against OpenGL ES 3.0 / WebGL2 instead of desktop GL 4.1 Core" OFF)
if (ENABLE_GLES AND ENABLE_LEGACY_GL)
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6 changes: 4 additions & 2 deletions src/desktop/backends/glfw2.c
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Expand Up @@ -159,13 +159,15 @@ bool platformInit(int32_t reqW, int32_t reqH, const char *title, bool headless)
glfwOpenWindowHint(GLFW_OPENGL_VERSION_MAJOR, 1);
glfwOpenWindowHint(GLFW_OPENGL_VERSION_MINOR, 1);
} else {
#ifdef ENABLE_GLES
#if defined(ENABLE_GLES2) || defined(ENABLE_GLES)
glfwOpenWindowHint(GLFW_CLIENT_API, GLFW_OPENGL_ES_API);
glfwOpenWindowHint(GLFW_OPENGL_VERSION_MAJOR, 3);
#ifdef ENABLE_GLES2
glfwOpenWindowHint(GLFW_OPENGL_VERSION_MAJOR, 2);
glfwOpenWindowHint(GLFW_OPENGL_VERSION_MINOR, 0);
#else
glfwOpenWindowHint(GLFW_OPENGL_VERSION_MAJOR, 3);
glfwOpenWindowHint(GLFW_OPENGL_VERSION_MINOR, 2);
#endif
glfwOpenWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
glfwOpenWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
glfwOpenWindowHint(GLFW_OPENGL_DEBUG_CONTEXT, GL_TRUE);
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6 changes: 5 additions & 1 deletion src/desktop/backends/glfw3.c
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Expand Up @@ -183,9 +183,13 @@ bool platformInit(int32_t reqW, int32_t reqH, const char *title, bool headless)
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 1);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 1);
} else {
#ifdef ENABLE_GLES
#if defined(ENABLE_GLES2) || defined(ENABLE_GLES)
glfwWindowHint(GLFW_CLIENT_API, GLFW_OPENGL_ES_API);
#ifdef ENABLE_GLES2
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 2);
#else
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
#endif
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0);
#else
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
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6 changes: 5 additions & 1 deletion src/desktop/backends/sdl2.c
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Expand Up @@ -93,11 +93,15 @@ bool platformInit(int reqW, int reqH, const char *title, bool headless) {
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 1);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 1);
} else if (gfx == MODERN_GL) {
#ifdef ENABLE_GLES
#if defined(ENABLE_GLES2) || defined(ENABLE_GLES)
#ifdef SDL_GL_CONTEXT_PROFILE_MASK
SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_ES);
#endif
#if defined(ENABLE_GLES2)
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 2);
#elif defined(ENABLE_GLES)
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
#endif
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 0);
#else
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
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