From: John Tsiombikas <nuclear@mutantstargoat.com>
Date: Wed, 6 Jun 2018 02:41:58 +0000 (+0300)
Subject: glDrawRangeElements in dbg_gui to shut the intel performance warnings up
X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?p=laserbrain_demo;a=commitdiff_plain;h=da8e3a1dd04a5ac29bcaa9582430c58a769ac571

glDrawRangeElements in dbg_gui to shut the intel performance warnings up
---

diff --git a/src/dbg_gui.cc b/src/dbg_gui.cc
index c1abce3..6a6511f 100644
--- a/src/dbg_gui.cc
+++ b/src/dbg_gui.cc
@@ -149,7 +149,12 @@ static void render_func(ImDrawData *ddat)
 				glTexCoordPointer(2, GL_FLOAT, sizeof *vbuf, &vbuf[0].uv);
 				glColorPointer(4, GL_UNSIGNED_BYTE, sizeof *vbuf, &vbuf[0].col);
 
-				glDrawElements(GL_TRIANGLES, cmd->ElemCount, GL_UNSIGNED_SHORT, ibuf);
+				if(glcaps.draw_range) {
+					int max_vidx = cmdlist->VtxBuffer.Size - 1;
+					glDrawRangeElements(GL_TRIANGLES, 0, max_vidx, cmd->ElemCount, GL_UNSIGNED_SHORT, ibuf);
+				} else {
+					glDrawElements(GL_TRIANGLES, cmd->ElemCount, GL_UNSIGNED_SHORT, ibuf);
+				}
 
 				glDisableClientState(GL_VERTEX_ARRAY);
 				glDisableClientState(GL_TEXTURE_COORD_ARRAY);
diff --git a/src/opengl.c b/src/opengl.c
index a7962c7..80f712d 100644
--- a/src/opengl.c
+++ b/src/opengl.c
@@ -17,6 +17,7 @@ int init_opengl(void)
 	glewInit();
 
 	glcaps.debug = GLEW_ARB_debug_output;
+	glcaps.draw_range = GLEW_EXT_draw_range_elements;
 
 #ifndef NDEBUG
 	if(glcaps.debug) {
diff --git a/src/opengl.h b/src/opengl.h
index 51d365a..c342384 100644
--- a/src/opengl.h
+++ b/src/opengl.h
@@ -5,6 +5,7 @@
 
 struct GLCaps {
 	int debug;	/* ARB_debug_output */
+	int draw_range;	/* EXT_draw_range_elements */
 };
 
 extern struct GLCaps glcaps;