void templateAppDraw(void)
{
static const float POSITION[8] = {
0.0f, 0.0f, // Down left (pivot point)
1.0f, 0.0f, // Up left
0.0f, 1.0f, // Down right
1.0f, 1.0f // Up right
};
static const float COLOR[16] = {
1.0f, 0.0f, 0.0f, 1.0f, // Red
0.0f, 1.0f, 0.0f, 1.0f, // Green
0.0f, 0.0f, 1.0f, 1.0f, // Blue
1.0f, 1.0f, 0.0f, 1.0f // Yellow
};
glClearColor(0.5f, 0.5f, 0.5f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT);
GFX_set_matrix_mode(MODELVIEW_MATRIX);
GFX_load_identity();
GFX_scale(100.0f, 100.0f, 0.0f);
if (program->pid) {
char attribute, uniform;
glUseProgram(program->pid);
uniform = PROGRAM_get_uniform_location(program, (char *)"MODELVIEWPROJECTIONMATRIX");
glUniformMatrix4fv(uniform, 1 /* How many 4x4 matrix */ ,
GL_FALSE /* Transpose the matrix? */ ,
(float *)GFX_get_modelview_projection_matrix());
attribute = PROGRAM_get_vertex_attrib_location(program, (char *)"POSITION");
glEnableVertexAttribArray(attribute);
glVertexAttribPointer(attribute, 2, GL_FLOAT, GL_FALSE, 0, POSITION);
attribute = PROGRAM_get_vertex_attrib_location(program, (char *)"COLOR");
glEnableVertexAttribArray(attribute);
glVertexAttribPointer(attribute, 4, GL_FLOAT, GL_FALSE, 0, COLOR);
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
}
}
void GFX_set_orthographic( float screen_ratio, float scale, float aspect_ratio, float clip_start, float clip_end, float screen_orientation )
{
scale = ( scale * 0.5f ) * aspect_ratio;
GFX_ortho( -1.0f,
1.0f,
-screen_ratio,
screen_ratio,
clip_start,
clip_end );
GFX_scale( 1.0f / scale, 1.0f / scale, 1.0f );
if( screen_orientation ) GFX_rotate( screen_orientation, 0.0f, 0.0f, 1.0f );
}
