From 46c9e3c84328b29a24b067bddef67a1f2f386359 Mon Sep 17 00:00:00 2001
From: TothBenoit <benoit.tothdenimal@gmail.com>
Date: Fri, 26 Jul 2024 15:29:29 +0200
Subject: [PATCH] Added hasExtension and glMultiDrawElementsIndirectCount
 support for SDL

---
 libs/sdl/GLImports.h |  1 +
 libs/sdl/gl.c        | 24 ++++++++++++++++++++++++
 libs/sdl/sdl/GL.hx   |  8 ++++++++
 3 files changed, 33 insertions(+)

diff --git a/libs/sdl/GLImports.h b/libs/sdl/GLImports.h
index c6e1222e5..50be901ee 100644
--- a/libs/sdl/GLImports.h
+++ b/libs/sdl/GLImports.h
@@ -58,6 +58,7 @@ GL_IMPORT(glBindFragDataLocation, BINDFRAGDATALOCATION);
 GL_IMPORT(glGenVertexArrays, GENVERTEXARRAYS);
 GL_IMPORT(glBindVertexArray, BINDVERTEXARRAY);
 GL_IMPORT(glDeleteVertexArrays, DELETEVERTEXARRAYS);
+GL_IMPORT(glGetStringi, GETSTRINGI);
 
 GL_IMPORT(glBeginQuery, BEGINQUERY);
 GL_IMPORT(glEndQuery, ENDQUERY);
diff --git a/libs/sdl/gl.c b/libs/sdl/gl.c
index 88c1fb2d4..4888c12bb 100644
--- a/libs/sdl/gl.c
+++ b/libs/sdl/gl.c
@@ -52,6 +52,10 @@
 #include "GLImports.h"
 #undef GL_IMPORT
 #define GL_IMPORT(fun,t)	fun = (PFNGL##t##PROC)SDL_GL_GetProcAddress(#fun); if( fun == NULL ) return 1
+#define GL_IMPORT_OPT(fun, t) PFNGL##t##PROC fun = NULL; if ( !fun ) { fun = (PFNGL##t##PROC)SDL_GL_GetProcAddress(#fun); if( fun == NULL ) hl_error("function not resolved"); }
+#else
+#define GL_IMPORT_OPT(fun, t)
+#define glMultiDrawElementsIndirectCountARB(...) hl_error("function not resolved");
 #endif
 
 static int GLLoadAPI() {
@@ -576,6 +580,11 @@ HL_PRIM void HL_NAME(gl_multi_draw_elements_indirect)( int mode, int type, vbyte
 #	endif
 }
 
+HL_PRIM void HL_NAME(gl_multi_draw_elements_indirect_count)(int mode, int type, vbyte* data, vbyte* drawcount, int maxdrawcount, int stride) {
+	GL_IMPORT_OPT(glMultiDrawElementsIndirectCountARB, MULTIDRAWELEMENTSINDIRECTCOUNTARB)
+	glMultiDrawElementsIndirectCountARB(mode, type, data, drawcount, maxdrawcount, stride);
+}
+
 HL_PRIM int HL_NAME(gl_get_config_parameter)( int feature ) {
 	switch( feature ) {
 	case 0:
@@ -595,6 +604,19 @@ HL_PRIM int HL_NAME(gl_get_config_parameter)( int feature ) {
 	return -1;
 }
 
+HL_PRIM bool HL_NAME(gl_has_extension)(vstring *name) {
+	const char* cname = hl_to_utf8(name->bytes);
+	GLint numExtensions = 0;
+	glGetIntegerv(GL_NUM_EXTENSIONS, &numExtensions);
+	for (int i = 0; i < numExtensions; i++) {
+		const char* ext = (const char*)glGetStringi(GL_EXTENSIONS, i);
+		if (ext && strcmp(cname, ext) == 0) {
+			return true;
+		}
+	}
+	return false;
+}
+
 // queries
 
 HL_PRIM vdynamic *HL_NAME(gl_create_query)() {
@@ -784,6 +806,7 @@ DEFINE_PRIM(_VOID,gl_draw_elements_instanced,_I32 _I32 _I32 _I32 _I32);
 DEFINE_PRIM(_VOID,gl_draw_arrays,_I32 _I32 _I32);
 DEFINE_PRIM(_VOID,gl_draw_arrays_instanced,_I32 _I32 _I32 _I32);
 DEFINE_PRIM(_VOID,gl_multi_draw_elements_indirect, _I32 _I32 _BYTES _I32 _I32);
+DEFINE_PRIM(_VOID,gl_multi_draw_elements_indirect_count, _I32 _I32 _BYTES _BYTES _I32 _I32);
 DEFINE_PRIM(_NULL(_I32),gl_create_vertex_array,_NO_ARG);
 DEFINE_PRIM(_VOID,gl_bind_vertex_array,_NULL(_I32));
 DEFINE_PRIM(_VOID,gl_delete_vertex_array,_NULL(_I32));
@@ -803,3 +826,4 @@ DEFINE_PRIM(_I32, gl_get_program_resource_index, _NULL(_I32) _I32 _STRING);
 DEFINE_PRIM(_VOID, gl_shader_storage_block_binding, _NULL(_I32) _I32 _I32);
 
 DEFINE_PRIM(_I32, gl_get_config_parameter, _I32);
+DEFINE_PRIM(_BOOL, gl_has_extension, _STRING);
diff --git a/libs/sdl/sdl/GL.hx b/libs/sdl/sdl/GL.hx
index 25a8d041e..3e1155645 100644
--- a/libs/sdl/sdl/GL.hx
+++ b/libs/sdl/sdl/GL.hx
@@ -39,6 +39,10 @@ class GL {
 		return 0;
 	}
 
+	public static function hasExtension( name : String ) : Bool {
+		return false;
+	}
+
 	public static function isContextLost() : Bool {
 		return false;
 	}
@@ -405,6 +409,9 @@ class GL {
 	public static function multiDrawElementsIndirect( mode : Int, type : Int, data : hl.Bytes, count : Int, stride : Int ) {
 	}
 
+	public static function multiDrawElementsIndirectCount( mode : Int, type : Int, data : hl.Bytes, drawcount : hl.Bytes, maxdrawcount : Int, stride : Int ) {
+	}
+
 	// queries
 
 	public static function createQuery() : Query {
@@ -917,6 +924,7 @@ class GL {
 	public static inline var READ_FRAMEBUFFER               = 0x8CA8;
 	public static inline var DRAW_FRAMEBUFFER               = 0x8CA9;
 	public static inline var DRAW_INDIRECT_BUFFER           = 0x8F3F;
+	public static inline var PARAMETER_BUFFER               = 0x80ee;
 
 	public static inline var RGBA4                          = 0x8056;
 	public static inline var RGB5_A1                        = 0x8057;