void Canvas::SetupVBO() {
if( m_vbo ) {
return;
}
CheckGLError( GLEXT_glGenBuffers( 1, &m_vbo ) );
CheckGLError( GLEXT_glBindBuffer( GLEXT_GL_ARRAY_BUFFER, m_vbo ) );
// GL_TRIANGLE_STRIP
GLbyte data[] = {
1, 1, 1, 1,
-1, 1, 0, 1,
1, -1, 1, 0,
-1, -1, 0, 0
};
CheckGLError( GLEXT_glBufferData( GLEXT_GL_ARRAY_BUFFER, sizeof( data ), data, GLEXT_GL_STATIC_DRAW ) );
CheckGLError( GLEXT_glBindBuffer( GLEXT_GL_ARRAY_BUFFER, 0 ) );
}
NonLegacyRenderer::NonLegacyRenderer() :
m_previous_window_size( -1, -1 ),
m_last_vertex_count( 0 ),
m_last_index_count( 0 ),
m_vbo_sync_type( INVALIDATE_ALL ),
m_vbo_synced( false ),
m_cull( false ),
m_use_fbo( false ) {
if( IsAvailable() ) {
auto load_result = m_shader.loadFromMemory(
"#version 130\n"
"uniform vec2 viewport_parameters;\n"
"in vec2 vertex;\n"
"in vec4 color;\n"
"in vec2 texture_coordinate;\n"
"out vec4 vertex_color;\n"
"out vec2 vertex_texture_coordinate;\n"
"void main() {\n"
"\tmat4 mvp_matrix = mat4(1.f);\n"
"\tmvp_matrix[3][0] = -1.f;\n"
"\tmvp_matrix[3][1] = 1.f;\n"
"\tmvp_matrix[0][0] = viewport_parameters.x;\n"
"\tmvp_matrix[1][1] = viewport_parameters.y;\n"
"\tmvp_matrix[2][2] = -1.f;\n"
"\tgl_Position = mvp_matrix * vec4(vertex.xy, 1.f, 1.f);\n"
"\tvertex_color = color;\n"
"\tvertex_texture_coordinate = texture_coordinate;\n"
"}\n",
"#version 130\n"
"uniform sampler2D texture0;\n"
"in vec4 vertex_color;\n"
"in vec2 vertex_texture_coordinate;\n"
"out vec4 fragment_color;\n"
"void main() {\n"
"\tfragment_color = vertex_color * texture(texture0, vertex_texture_coordinate);\n"
"}\n"
);
if( !load_result ) {
shader_supported = false;
#if defined( SFGUI_DEBUG )
std::cerr << "Non-legacy renderer unavailable.\n";
#endif
return;
}
m_vertex_location = GetAttributeLocation( m_shader, "vertex" );
m_color_location = GetAttributeLocation( m_shader, "color" );
m_texture_coordinate_location = GetAttributeLocation( m_shader, "texture_coordinate" );
CheckGLError( GLEXT_glGenBuffers( 1, &m_vertex_vbo ) );
CheckGLError( GLEXT_glGenBuffers( 1, &m_color_vbo ) );
CheckGLError( GLEXT_glGenBuffers( 1, &m_texture_vbo ) );
CheckGLError( GLEXT_glGenBuffers( 1, &m_index_vbo ) );
}
else {
#if defined( SFGUI_DEBUG )
std::cerr << "Non-legacy renderer unavailable.\n";
#endif
}
}
