/*
===========================================================================
Copyright (C) 2016 James Canete

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
===========================================================================
*/

#include "tr_local.h"

#include "tr_dsa.h"

static struct
{
	GLuint textures[NUM_TEXTURE_BUNDLES];
	GLenum texunit;
}
glDsaState;

void GL_BindNullTextures()
{
	int i;

	if (glRefConfig.directStateAccess)
	{
		for (i = 0; i < NUM_TEXTURE_BUNDLES; i++)
		{
			qglBindMultiTexture(GL_TEXTURE0_ARB + i, GL_TEXTURE_2D, 0);
			glDsaState.textures[i] = 0;
		}
	}
	else
	{
		for (i = 0; i < NUM_TEXTURE_BUNDLES; i++)
		{
			qglActiveTextureARB(GL_TEXTURE0_ARB + i);
			qglBindTexture(GL_TEXTURE_2D, 0);
			glDsaState.textures[i] = 0;
		}

		qglActiveTextureARB(GL_TEXTURE0_ARB);
		glDsaState.texunit = GL_TEXTURE0_ARB;
	}
}

void GL_BindMultiTexture(GLenum texunit, GLenum target, GLuint texture)
{
	GLuint tmu = texunit - GL_TEXTURE0_ARB;

	if (glDsaState.textures[tmu] == texture)
		return;

	qglBindMultiTexture(texunit, target, texture);
	glDsaState.textures[tmu] = texture;
}

GLvoid APIENTRY GLDSA_BindMultiTexture(GLenum texunit, GLenum target, GLuint texture)
{
	if (glDsaState.texunit != texunit)
	{
		qglActiveTextureARB(texunit);
		glDsaState.texunit = texunit;
	}

	qglBindTexture(target, texture);
}

GLvoid APIENTRY GLDSA_TextureParameterf(GLuint texture, GLenum target, GLenum pname, GLfloat param)
{
	GL_BindMultiTexture(glDsaState.texunit, target, texture);
	qglTexParameterf(target, pname, param);
}

GLvoid APIENTRY GLDSA_TextureParameteri(GLuint texture, GLenum target, GLenum pname, GLint param)
{
	GL_BindMultiTexture(glDsaState.texunit, target, texture);
	qglTexParameteri(target, pname, param);
}

GLvoid APIENTRY GLDSA_TextureImage2D(GLuint texture, GLenum target, GLint level, GLint internalformat,
	GLsizei width, GLsizei height, GLint border, GLenum format, GLenum type, const GLvoid *pixels)
{
	GL_BindMultiTexture(glDsaState.texunit, target, texture);
	qglTexImage2D(target, level, internalformat, width, height, border, format, type, pixels);
}

GLvoid APIENTRY GLDSA_TextureSubImage2D(GLuint texture, GLenum target, GLint level, GLint xoffset, GLint yoffset,
	GLsizei width, GLsizei height, GLenum format, GLenum type, const GLvoid *pixels)
{
	GL_BindMultiTexture(glDsaState.texunit, target, texture);
	qglTexSubImage2D(target, level, xoffset, yoffset, width, height, format, type, pixels);
}

GLvoid APIENTRY GLDSA_CopyTextureImage2D(GLuint texture, GLenum target, GLint level, GLenum internalformat,
	GLint x, GLint y, GLsizei width, GLsizei height, GLint border)
{
	GL_BindMultiTexture(glDsaState.texunit, target, texture);
	qglCopyTexImage2D(target, level, internalformat, x, y, width, height, border);
}

GLvoid APIENTRY  GLDSA_CompressedTextureImage2D(GLuint texture, GLenum target, GLint level, GLenum internalformat,
	GLsizei width, GLsizei height, GLint border, GLsizei imageSize, const GLvoid *data)
{
	GL_BindMultiTexture(glDsaState.texunit, target, texture);
	qglCompressedTexImage2DARB(target, level, internalformat, width, height, border, imageSize, data);
}

GLvoid APIENTRY GLDSA_CompressedTextureSubImage2D(GLuint texture, GLenum target, GLint level,
	GLint xoffset, GLint yoffset, GLsizei width, GLsizei height, GLenum format,
	GLsizei imageSize, const GLvoid *data)
{
	GL_BindMultiTexture(glDsaState.texunit, target, texture);
	qglCompressedTexSubImage2DARB(target, level, xoffset, yoffset, width, height, format, imageSize, data);
}

GLvoid APIENTRY GLDSA_GenerateTextureMipmap(GLuint texture, GLenum target)
{
	GL_BindMultiTexture(glDsaState.texunit, target, texture);
	qglGenerateMipmapEXT(target);
}