opengl_vbo.c

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/*
 * See Licensing and Copyright notice in naev.h
 */
#include "naev.h"
#include "log.h"
#include "opengl.h"
 
#define BUFFER_OFFSET(i) ((char *)(sizeof(char) * (i))) 
typedef enum gl_vboType_e {
   NGL_VBO_NULL, 
   NGL_VBO_STREAM, 
   NGL_VBO_DYNAMIC, 
   NGL_VBO_STATIC 
} gl_vboType;
 
struct gl_vbo_s {
   GLuint id; 
   gl_vboType type; 
   GLsizei size; 
   char* data; 
};
 
static gl_vbo* gl_vboCreate( GLenum target, GLsizei size, const void* data, GLenum usage );
 
int gl_initVBO (void)
{
   return 0;
}
 
void gl_exitVBO (void)
{
}
 
static gl_vbo* gl_vboCreate( GLenum target, GLsizei size, const void* data, GLenum usage )
{
   gl_vbo *vbo;
 
   /* Allocate. */
   vbo = calloc( 1, sizeof(gl_vbo) );
 
   /* General stuff. */
   vbo->size = size;
 
   /* Create the buffer. */
   glGenBuffers( 1, &vbo->id );
 
   /* Upload the data. */
   glBindBuffer( target, vbo->id );
   glBufferData( target, size, data, usage );
   glBindBuffer( target, 0 );
 
   /* Check for errors. */
   gl_checkErr();
 
   return vbo;
}
 
void gl_vboData( gl_vbo *vbo, GLsizei size, const void* data )
{
   GLenum usage;
 
   vbo->size = size;
 
   /* Get usage. */
   if (vbo->type == NGL_VBO_STREAM)
      usage = GL_STREAM_DRAW;
   else if (vbo->type == NGL_VBO_DYNAMIC)
      usage = GL_DYNAMIC_DRAW;
   else if (vbo->type == NGL_VBO_STATIC)
      usage = GL_STATIC_DRAW;
   else
      usage = GL_STREAM_DRAW;
 
   /* Get new data. */
   glBindBuffer( GL_ARRAY_BUFFER, vbo->id );
   glBufferData( GL_ARRAY_BUFFER, size, data, usage );
 
   /* Check for errors. */
   gl_checkErr();
}
 
void gl_vboSubData( gl_vbo *vbo, GLint offset, GLsizei size, const void* data )
{
   glBindBuffer( GL_ARRAY_BUFFER, vbo->id );
   glBufferSubData( GL_ARRAY_BUFFER, offset, size, data );
 
   /* Check for errors. */
   gl_checkErr();
}
 
gl_vbo* gl_vboCreateStream( GLsizei size, const void* data )
{
   gl_vbo *vbo = gl_vboCreate( GL_ARRAY_BUFFER, size, data, GL_STREAM_DRAW );
   vbo->type = NGL_VBO_STREAM;
 
   /* Check for errors. */
   gl_checkErr();
 
   return vbo;
}
 
gl_vbo* gl_vboCreateDynamic( GLsizei size, const void* data )
{
   gl_vbo *vbo = gl_vboCreate( GL_ARRAY_BUFFER, size, data, GL_DYNAMIC_DRAW );
   vbo->type = NGL_VBO_DYNAMIC;
 
   /* Check for errors. */
   gl_checkErr();
 
   return vbo;
}
 
gl_vbo* gl_vboCreateStatic( GLsizei size, const void* data )
{
   gl_vbo *vbo = gl_vboCreate( GL_ARRAY_BUFFER, size, data, GL_STATIC_DRAW );
   vbo->type = NGL_VBO_STATIC;
 
   /* Check for errors. */
   gl_checkErr();
 
   return vbo;
}
 
void* gl_vboMap( gl_vbo *vbo )
{
   glBindBuffer( GL_ARRAY_BUFFER, vbo->id );
   return glMapBuffer( GL_ARRAY_BUFFER, GL_WRITE_ONLY );
}
 
void gl_vboUnmap( gl_vbo *vbo )
{
   (void) vbo;
   glUnmapBuffer( GL_ARRAY_BUFFER );
 
   /* Check for errors. */
   gl_checkErr();
}
 
void gl_vboActivateAttribOffset( gl_vbo *vbo, GLuint index, GLuint offset,
      GLint size, GLenum type, GLsizei stride )
{
   const GLvoid *pointer;
 
   /* Set up. */
   glBindBuffer( GL_ARRAY_BUFFER, vbo->id );
   pointer = BUFFER_OFFSET(offset);
 
   glVertexAttribPointer( index, size, type, GL_FALSE, stride, pointer );
 
   /* Check for errors. */
   gl_checkErr();
}
 
void gl_vboDestroy( gl_vbo *vbo )
{
   if (vbo == NULL)
      return;
 
   glDeleteBuffers( 1, &vbo->id );
   gl_checkErr();
   free(vbo);
}