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/* glsl-utils.h --- support functions for GLSL in OpenGL hacks.
* Copyright (c) 2020-2021 Carsten Steger <carsten@mirsanmir.org>
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that
* copyright notice and this permission notice appear in supporting
* documentation. No representations are made about the suitability of this
* software for any purpose. It is provided "as is" without express or
* implied warranty.
*/
#ifndef __GLSL_UTILS_H__
#define __GLSL_UTILS_H__
#ifdef HAVE_GLSL
/* Column-major linearized matrix coordinate */
#define GLSL__LINCOOR(r,c,h) ((c)*(h)+(r))
/* Copy a 4x4 column-major matrix: c = m. */
extern void glsl_CopyMatrix(GLfloat c[16], GLfloat m[16]);
/* Create a 4x4 column-major identity matrix. */
extern void glsl_Identity(GLfloat c[16]);
/* Multiply two 4x4 column-major matrices: c = c*m. */
extern void glsl_MultMatrix(GLfloat c[16], GLfloat m[16]);
/* Multiply a 4x4 column-major matrix by a rotation matrix that rotates
around the axis (x,y,z) by the angle angle: c = c*r(angle,x,y,z). */
extern void glsl_Rotate(GLfloat c[16], GLfloat angle, GLfloat x, GLfloat y,
GLfloat z);
/* Multiply a 4x4 column-major matrix by a matrix that stretches, shrinks,
or reflects an object along the axes: c = c*s(sx,sy,sz). */
extern void glsl_Scale(GLfloat c[16], GLfloat sx, GLfloat sy, GLfloat sz);
/* Multiply a 4x4 column-major matrix by a matrix that translates an object
by a translation vector: c = c*t(tx,ty,tz). */
extern void glsl_Translate(GLfloat c[16], GLfloat tx, GLfloat ty, GLfloat tz);
/* Add a perspective projection to a 4x4 column-major matrix. */
extern void glsl_Perspective(GLfloat c[16], GLfloat fovy, GLfloat aspect,
GLfloat z_near, GLfloat z_far);
/* Add an orthographic projection to a 4x4 column-major matrix. */
extern void glsl_Orthographic(GLfloat c[16], GLfloat left, GLfloat right,
GLfloat bottom, GLfloat top,
GLfloat nearval, GLfloat farval);
/* Get the OpenGL and GLSL versions. */
extern GLboolean glsl_GetGlAndGlslVersions(GLint *gl_major,
GLint *gl_minor,
GLint *glsl_major,
GLint *glsl_minor,
GLboolean *gl_gles3);
/* Compile and link a vertex and a Fragment shader into a GLSL program. */
extern GLboolean glsl_CompileAndLinkShaders(GLsizei vertex_shader_count,
const GLchar **vertex_shader_source,
GLsizei fragment_shader_count,
const GLchar **fragment_shader_source,
GLuint *shader_program);
#endif /* HAVE_GLSL */
#endif /* __GLSL_UTILS_H__ */
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