# HG changeset patch
# User John Tsiombikas <nuclear@member.fsf.org>
# Date 1435470505 -10800
# Node ID d6209903454bb4a144cb87d0aa7ce456f497edbe
# Parent  b1a195c3ee1689b84e6e425082079c3459a20b47
opengl capabilities

diff -r b1a195c3ee16 -r d6209903454b src/game.cc
--- a/src/game.cc	Sun Jun 28 08:34:24 2015 +0300
+++ b/src/game.cc	Sun Jun 28 08:48:25 2015 +0300
@@ -1,5 +1,5 @@
 #include <stdio.h>
-#include <GL/glew.h>
+#include "opengl.h"
 #include "game.h"
 #include "board.h"
 #include "scenery.h"
@@ -21,23 +21,32 @@
 
 bool game_init()
 {
+	if(init_opengl() == -1) {
+		return false;
+	}
+
 	glEnable(GL_DEPTH_TEST);
 	glEnable(GL_CULL_FACE);
 	glEnable(GL_NORMALIZE);
 	glEnable(GL_LIGHTING);
 	glEnable(GL_LIGHT0);
 
-	if(GLEW_ARB_multisample) {
+	if(glcaps.sep_spec) {
+		glLightModeli(GL_LIGHT_MODEL_COLOR_CONTROL, GL_SEPARATE_SPECULAR_COLOR);
+	}
+
+	if(glcaps.fsaa) {
 		glEnable(GL_MULTISAMPLE);
 	}
 
-	Mesh::use_custom_sdr_attr = false;
-
-	if(!(sdr_phong = create_program_load("sdr/phong.v.glsl", "sdr/phong.p.glsl"))) {
-		return false;
-	}
-	if(!(sdr_phong_notex = create_program_load("sdr/phong.v.glsl", "sdr/phong-notex.p.glsl"))) {
-		return false;
+	if(glcaps.shaders) {
+		Mesh::use_custom_sdr_attr = false;
+		if(!(sdr_phong = create_program_load("sdr/phong.v.glsl", "sdr/phong.p.glsl"))) {
+			return false;
+		}
+		if(!(sdr_phong_notex = create_program_load("sdr/phong.v.glsl", "sdr/phong-notex.p.glsl"))) {
+			return false;
+		}
 	}
 
 	if(!board.init()) {
diff -r b1a195c3ee16 -r d6209903454b src/mesh.cc
--- a/src/mesh.cc	Sun Jun 28 08:34:24 2015 +0300
+++ b/src/mesh.cc	Sun Jun 28 08:48:25 2015 +0300
@@ -564,9 +564,10 @@
 
 void Mesh::draw() const
 {
-	int cur_sdr;
-	glGetIntegerv(GL_CURRENT_PROGRAM, &cur_sdr);
-
+	int cur_sdr = 0;
+	if(glcaps.shaders) {
+		glGetIntegerv(GL_CURRENT_PROGRAM, &cur_sdr);
+	}
 
 	((Mesh*)this)->update_buffers();
 
@@ -720,8 +721,10 @@
 void Mesh::draw_normals() const
 {
 #ifdef USE_OLDGL
-	int cur_sdr;
-	glGetIntegerv(GL_CURRENT_PROGRAM, &cur_sdr);
+	int cur_sdr = 0;
+	if(glcaps.shaders) {
+		glGetIntegerv(GL_CURRENT_PROGRAM, &cur_sdr);
+	}
 
 	Vector3 *varr = (Vector3*)get_attrib_data(MESH_ATTR_VERTEX);
 	Vector3 *norm = (Vector3*)get_attrib_data(MESH_ATTR_NORMAL);
@@ -756,8 +759,10 @@
 void Mesh::draw_tangents() const
 {
 #ifdef USE_OLDGL
-	int cur_sdr;
-	glGetIntegerv(GL_CURRENT_PROGRAM, &cur_sdr);
+	int cur_sdr = 0;
+	if(glcaps.shaders) {
+		glGetIntegerv(GL_CURRENT_PROGRAM, &cur_sdr);
+	}
 
 	Vector3 *varr = (Vector3*)get_attrib_data(MESH_ATTR_VERTEX);
 	Vector3 *tang = (Vector3*)get_attrib_data(MESH_ATTR_TANGENT);
diff -r b1a195c3ee16 -r d6209903454b src/object.cc
--- a/src/object.cc	Sun Jun 28 08:34:24 2015 +0300
+++ b/src/object.cc	Sun Jun 28 08:48:25 2015 +0300
@@ -69,7 +69,9 @@
 
 void Object::set_shader(unsigned int sdr)
 {
-	this->sdr = sdr;
+	if(GLEW_ARB_vertex_shader && GLEW_ARB_fragment_shader) {
+		this->sdr = sdr;
+	}
 }
 
 void Object::draw() const
diff -r b1a195c3ee16 -r d6209903454b src/opengl.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/opengl.c	Sun Jun 28 08:48:25 2015 +0300
@@ -0,0 +1,14 @@
+#include "opengl.h"
+
+struct GLCaps glcaps;
+
+int init_opengl()
+{
+	glewInit();
+
+	glcaps.shaders = GLEW_ARB_vertex_shader && GLEW_ARB_fragment_shader;
+	glcaps.fsaa = GLEW_ARB_multisample;
+	glcaps.sep_spec = GLEW_EXT_separate_specular_color;
+
+	return 0;
+}
diff -r b1a195c3ee16 -r d6209903454b src/opengl.h
--- a/src/opengl.h	Sun Jun 28 08:34:24 2015 +0300
+++ b/src/opengl.h	Sun Jun 28 08:48:25 2015 +0300
@@ -3,4 +3,21 @@
 
 #include <GL/glew.h>
 
+struct GLCaps {
+	int shaders;
+	int fsaa;
+	int sep_spec;
+};
+extern struct GLCaps glcaps;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+int init_opengl();
+
+#ifdef __cplusplus
+}
+#endif
+
 #endif	/* OPENGL_H_ */