From a0738d109b713c66baf5bebc3b8995861e82584b Mon Sep 17 00:00:00 2001
From: milek7 <me@milek7.pl>
Date: Sun, 17 Mar 2019 23:17:35 +0100
Subject: [PATCH] geometry shader changes

---
 gl/shader.cpp           | 29 ++++++++++++++++++-----------
 renderer.cpp            |  3 +++
 widgets/map.cpp         | 19 ++++++++++++-------
 widgets/map_objects.cpp |  1 +
 widgets/popup.cpp       |  1 +
 5 files changed, 35 insertions(+), 18 deletions(-)

diff --git a/gl/shader.cpp b/gl/shader.cpp
index a7d28a2f..4a524578 100644
--- a/gl/shader.cpp
+++ b/gl/shader.cpp
@@ -202,6 +202,17 @@ void gl::shader::log_error(const std::string &str)
 gl::shader::shader(const std::string &filename)
 {
     name = filename;
+
+	GLuint type;
+	if (strcend(filename, ".vert"))
+		type = GL_VERTEX_SHADER;
+	else if (strcend(filename, ".frag"))
+		type = GL_FRAGMENT_SHADER;
+	else if (strcend(filename, ".geom"))
+		type = GL_GEOMETRY_SHADER;
+	else
+		throw shader_exception("unknown shader " + filename);
+
     std::string str;
     if (!Global.gfx_usegles)
     {
@@ -209,7 +220,13 @@ gl::shader::shader(const std::string &filename)
     }
     else
     {
-        str += "#version 300 es\n";
+		if (type == GL_GEOMETRY_SHADER) {
+			str += "#version 310 es\n";
+			str += "#extension EXT_geometry_shader : require\n";
+		}
+		else {
+			str += "#version 300 es\n";
+		}
         str += "precision highp float;\n";
         str += "precision highp sampler2DShadow;\n";
     }
@@ -223,16 +240,6 @@ gl::shader::shader(const std::string &filename)
     if (!cstr[0])
         throw shader_exception("cannot read shader: " + filename);
 
-    GLuint type;
-    if (strcend(filename, ".vert"))
-        type = GL_VERTEX_SHADER;
-    else if (strcend(filename, ".frag"))
-        type = GL_FRAGMENT_SHADER;
-	else if (strcend(filename, ".geom"))
-		type = GL_GEOMETRY_SHADER;
-    else
-        throw shader_exception("unknown shader " + filename);
-
     **this = glCreateShader(type);
     glShaderSource(*this, 1, &cstr, 0);
     glCompileShader(*this);
diff --git a/renderer.cpp b/renderer.cpp
index 597d1da3..442f01a4 100644
--- a/renderer.cpp
+++ b/renderer.cpp
@@ -3901,6 +3901,9 @@ bool opengl_renderer::Init_caps()
 
 		if (GLAD_GL_EXT_clip_control)
 			WriteLog("EXT_clip_control supported!");
+
+		if (GLAD_GL_EXT_geometry_shader)
+			WriteLog("EXT_geometry_shader supported!");
 	}
 
 	glGetError();
diff --git a/widgets/map.cpp b/widgets/map.cpp
index 04920633..8bc195dd 100644
--- a/widgets/map.cpp
+++ b/widgets/map.cpp
@@ -16,11 +16,14 @@ ui::map_panel::map_panel() : ui_panel(LOC_STR(ui_map), false)
 
 	gl::shader vert("map.vert");
 	gl::shader frag("map.frag");
-	gl::shader poi_frag("map_poi.frag");
-	gl::shader poi_geom("map_poi.geom");
+
 	m_track_shader = std::unique_ptr<gl::program>(new gl::program({vert, frag}));
-	m_poi_shader = std::unique_ptr<gl::program>(new gl::program({vert, poi_frag, poi_geom}));
-	m_icon_atlas = GfxRenderer.Fetch_Texture("map_icons");
+	if (GLAD_GL_EXT_geometry_shader) {
+		gl::shader poi_frag("map_poi.frag");
+		gl::shader poi_geom("map_poi.geom");
+		m_poi_shader = std::unique_ptr<gl::program>(new gl::program({vert, poi_frag, poi_geom}));
+		m_icon_atlas = GfxRenderer.Fetch_Texture("map_icons");
+	}
 
 	m_tex = std::make_unique<opengl_texture>();
 	m_tex->alloc_rendertarget(GL_RGB8, GL_RGB, fb_size, fb_size);
@@ -120,9 +123,11 @@ void ui::map_panel::render_map_texture(glm::mat4 transform, glm::vec2 surface_si
 	scene_ubo->update(scene_ubs);
 	GfxRenderer.Draw_Geometry(m_switch_handles.begin(), m_switch_handles.end());
 
-	GfxRenderer.Bind_Texture(0, m_icon_atlas);
-	m_poi_shader->bind();
-	scene_ubs.scene_extra = glm::vec3(1.0f / (surface_size / 200.0f), 1.0f);
+	if (GLAD_GL_EXT_geometry_shader) {
+		GfxRenderer.Bind_Texture(0, m_icon_atlas);
+		m_poi_shader->bind();
+		scene_ubs.scene_extra = glm::vec3(1.0f / (surface_size / 200.0f), 1.0f);
+	}
 
 	scene_ubs.time = 1.0f;
 	scene_ubo->update(scene_ubs);
diff --git a/widgets/map_objects.cpp b/widgets/map_objects.cpp
index a7eb30d9..10709c65 100644
--- a/widgets/map_objects.cpp
+++ b/widgets/map_objects.cpp
@@ -1,3 +1,4 @@
+#include "stdafx.h"
 #include "widgets/map_objects.h"
 
 map::objects map::Objects;
diff --git a/widgets/popup.cpp b/widgets/popup.cpp
index 95b0983d..75633c38 100644
--- a/widgets/popup.cpp
+++ b/widgets/popup.cpp
@@ -1,3 +1,4 @@
+#include "stdafx.h"
 #include "widgets/popup.h"
 
 ui::popup::popup(ui_panel &panel) : m_parent(panel) {}