911d635e6e
This helper correctly sets the viewport to the size of a screen. Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
96 lines
3.1 KiB
C
96 lines
3.1 KiB
C
/*
|
|
* GL - Graphics Layer
|
|
*
|
|
* Copyright (c) 2011-2012 David Herrmann <dh.herrmann@googlemail.com>
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining
|
|
* a copy of this software and associated documentation files
|
|
* (the "Software"), to deal in the Software without restriction, including
|
|
* without limitation the rights to use, copy, modify, merge, publish,
|
|
* distribute, sublicense, and/or sell copies of the Software, and to
|
|
* permit persons to whom the Software is furnished to do so, subject to
|
|
* the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included
|
|
* in all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
|
|
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
|
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
|
|
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
|
|
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
|
|
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
|
|
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
|
*/
|
|
|
|
/*
|
|
* Graphics Layer
|
|
* This provides lots of helpers to work with OpenGL APIs. This includes
|
|
* math-helpers, basic shaders and a texture-API. If working with this API,
|
|
* there must always be a valid OpenGL-context!
|
|
*/
|
|
|
|
#ifndef GL_GL_H
|
|
#define GL_GL_H
|
|
|
|
#include <stdbool.h>
|
|
#include <stdlib.h>
|
|
#include "uterm.h"
|
|
|
|
/* miscellaneous */
|
|
void gl_clear_error();
|
|
bool gl_has_error();
|
|
void gl_viewport(struct uterm_screen *screen);
|
|
|
|
/*
|
|
* Math Helpers
|
|
* The gl_m4 type is a 4x4 matrix of floats. The gl_m4_stack is a stack of m4
|
|
* matrices where you can only access the top-most member.
|
|
*/
|
|
|
|
struct gl_m4_stack;
|
|
|
|
void gl_m4_identity(float *m);
|
|
void gl_m4_copy(float *dest, const float *src);
|
|
void gl_m4_mult_dest(float *dest, const float *n, const float *m);
|
|
void gl_m4_mult(float *n, const float *m);
|
|
void gl_m4_translate(float *m, float x, float y, float z);
|
|
void gl_m4_scale(float *m, float x, float y, float z);
|
|
void gl_m4_transpose_dest(float *dest, const float *src);
|
|
void gl_m4_transpose(float *m);
|
|
|
|
int gl_m4_stack_new(struct gl_m4_stack **out);
|
|
void gl_m4_stack_free(struct gl_m4_stack *stack);
|
|
float *gl_m4_stack_push(struct gl_m4_stack *stack);
|
|
float *gl_m4_stack_pop(struct gl_m4_stack *stack);
|
|
float *gl_m4_stack_tip(struct gl_m4_stack *stack);
|
|
|
|
/*
|
|
* Texture API
|
|
* This allows to create new textures which can then be used to draw images with
|
|
* the shader API.
|
|
*/
|
|
|
|
unsigned int gl_tex_new();
|
|
void gl_tex_free(unsigned int tex);
|
|
void gl_tex_load(unsigned int tex, unsigned int width,
|
|
unsigned int height, void *buf);
|
|
|
|
/*
|
|
* Shader API
|
|
*/
|
|
|
|
struct gl_shader;
|
|
|
|
int gl_shader_new(struct gl_shader **out);
|
|
void gl_shader_ref(struct gl_shader *shader);
|
|
void gl_shader_unref(struct gl_shader *shader);
|
|
|
|
void gl_shader_draw_def(struct gl_shader *shader, float *vertices,
|
|
float *colors, size_t num);
|
|
void gl_shader_draw_tex(struct gl_shader *shader, const float *vertices,
|
|
const float *texcoords, size_t num,
|
|
unsigned int tex, const float *m);
|
|
|
|
#endif /* GL_GL_H */
|