Add basic support for geometry shaders

[libs/gl.git] / source / shader.cpp

diff --git a/source/shader.cpp b/source/shader.cpp
index ac604630904a6c8db9632dff8f8e715976f2d0cf..17bf3fad3196ad08b735669bda32f72bf2212a92 100644 (file)
--- a/source/shader.cpp
+++ b/source/shader.cpp
@@ -1,11 +1,9 @@
-/* $Id$
-
-This file is part of libmspgl
-Copyright © 2007 Mikko Rasa, Mikkosoft Productions
-Distributed under the LGPL
-*/
-
-#define GL_GLEXT_PROTOTYPES
+#include <msp/gl/extensions/arb_fragment_shader.h>
+#include <msp/gl/extensions/arb_shader_objects.h>
+#include <msp/gl/extensions/arb_vertex_shader.h>
+#include <msp/gl/extensions/ext_geometry_shader4.h>
+#include "error.h"
+#include "misc.h"
 #include "shader.h"
 
 using namespace std;
@@ -13,9 +11,31 @@ using namespace std;
 namespace Msp {
 namespace GL {
 
-Shader::Shader(ShaderType t)
+Shader::Shader(GLenum t)
+{
+       init(t);
+}
+
+Shader::Shader(GLenum t, const string &src)
+{
+       init(t);
+
+       source(src);
+       compile();
+}
+
+void Shader::init(GLenum t)
 {
-       id=glCreateShader(t);
+       compiled = false;
+
+       if(t==GL_FRAGMENT_SHADER)
+               static Require _req(ARB_fragment_shader);
+       else if(t==GL_VERTEX_SHADER)
+               static Require _req(ARB_vertex_shader);
+       else if(t==GL_GEOMETRY_SHADER)
+               static Require _req(EXT_geometry_shader4);
+
+       id = glCreateShader(t);
 }
 
 Shader::~Shader()
@@ -23,7 +43,7 @@ Shader::~Shader()
        glDeleteShader(id);
 }
 
-void Shader::source(sizei count, const char **str, const int *len)
+void Shader::source(unsigned count, const char **str, const int *len)
 {
        glShaderSource(id, count, str, len);
 }
@@ -38,27 +58,50 @@ void Shader::source(const char *str, int len)
        source(1, &str, &len);
 }
 
-bool Shader::compile()
+void Shader::compile()
 {
        glCompileShader(id);
-       compiled=get_param(GL_COMPILE_STATUS);
-       return compiled;
-}
-
-int Shader::get_param(GLenum param) const
-{
-       int value;
-       glGetShaderiv(id, param, &value);
-       return value;
+       compiled = get_shader_i(id, GL_COMPILE_STATUS);
+       if(!compiled)
+               throw compile_error(get_info_log());
 }
 
 string Shader::get_info_log() const
 {
-       sizei len=get_param(GL_INFO_LOG_LENGTH);
-       char log[len+1];
-       glGetShaderInfoLog(id, len+1, reinterpret_cast<GLsizei *>(&len), log);
-       return string(log, len);
+       GLsizei len = get_shader_i(id, GL_INFO_LOG_LENGTH);
+       char *buf = new char[len+1];
+       glGetShaderInfoLog(id, len+1, &len, buf);
+       string log(buf, len);
+       delete[] buf;
+       return log;
 }
 
+
+VertexShader::VertexShader():
+       Shader(GL_VERTEX_SHADER)
+{ }
+
+VertexShader::VertexShader(const string &src):
+       Shader(GL_VERTEX_SHADER, src)
+{ }
+
+
+FragmentShader::FragmentShader():
+       Shader(GL_FRAGMENT_SHADER)
+{ }
+
+FragmentShader::FragmentShader(const string &src):
+       Shader(GL_FRAGMENT_SHADER, src)
+{ }
+
+
+GeometryShader::GeometryShader():
+       Shader(GL_GEOMETRY_SHADER)
+{ }
+
+GeometryShader::GeometryShader(const string &src):
+       Shader(GL_GEOMETRY_SHADER, src)
+{ }
+
 } // namespace GL
 } // namespace Msp