/* Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).

 *

 * 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

 * BRIAN PAUL 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.

 *

 * Initial Contributors:

 * Nokia Corporation - initial contribution.

 *

 * Contributors:

 *

 * Description:

 *

 */

#include "common.h"

#include "hgl.h"

#include "context.h"

const char* const DGLES2_INFO_LOG_INVALID_SHADERS = \

	"A program must have exactly one vertex shader and one fragment shader.";

DGLProgram* DGLProgram_create(GLuint name)

{

	if(program == NULL)

	{

		return NULL;

	}

	program->obj.name = name;

	program->obj.next = NULL;

	// Defer everything to the host GL by default.

	program->link_status = GL_TRUE;

	program->validate_status = GL_TRUE;

	return program;

}

void DGLProgram_destroy(DGLProgram *program)

{

	DGLES2_ASSERT(program != NULL);

	free(program);

}

GL_APICALL_BUILD void GL_APIENTRY glAttachShader (GLuint program, GLuint shader)

{

	DGLES2_ENTER();

	DGLES2_ERROR_IF(ctx->hgl.IsShader(program), GL_INVALID_OPERATION);

	DGLES2_ERROR_IF(!ctx->hgl.IsProgram(program), GL_INVALID_VALUE);

	DGLES2_ERROR_IF(ctx->hgl.IsProgram(shader), GL_INVALID_OPERATION);

	DGLES2_ERROR_IF(!ctx->hgl.IsShader(shader), GL_INVALID_VALUE);

    ctx->hgl.AttachShader(program, shader);

	DGLES2_LEAVE();

}

GL_APICALL_BUILD void GL_APIENTRY glBindAttribLocation(GLuint program, GLuint index, const char* name)

{

	DGLES2_ENTER();

	DGLES2_ERROR_IF(ctx->hgl.IsShader(program), GL_INVALID_OPERATION);

	DGLES2_ERROR_IF(!ctx->hgl.IsProgram(program), GL_INVALID_VALUE);

	DGLES2_ERROR_IF(index >= ctx->max_vertex_attribs, GL_INVALID_VALUE);

	DGLES2_ERROR_IF(strncmp(name, "gl_", 3) == 0, GL_INVALID_OPERATION);

    ctx->hgl.BindAttribLocation(program, index, name);

	DGLES2_LEAVE();

}

GL_APICALL_BUILD GLuint GL_APIENTRY glCreateProgram(void)

{

	DGLES2_ENTER_RET(0);

	{

		GLuint name;

		DGLContext_getHostError(ctx);

		name = ctx->hgl.CreateProgram();

		if(DGLContext_getHostError(ctx) == GL_NO_ERROR && name != 0)

		{

			DGLContext_createProgram(ctx, name);

		}

		DGLES2_LEAVE_RET(name);

	}

}

GL_APICALL_BUILD void GL_APIENTRY glDeleteProgram(GLuint program)

{

	DGLES2_ENTER();

	if(program != 0)

	{

		DGLES2_ERROR_IF(ctx->hgl.IsShader(program), GL_INVALID_OPERATION);

		DGLES2_ERROR_IF(!ctx->hgl.IsProgram(program), GL_INVALID_VALUE);

		ctx->hgl.DeleteProgram(program);

		if(DGLContext_getHostError(ctx) == GL_NO_ERROR)

		{

			DGLContext_destroyProgram(ctx, program);

		}

	}

	DGLES2_LEAVE();

}

GL_APICALL_BUILD void GL_APIENTRY glDetachShader(GLuint program, GLuint shader)

{

	DGLES2_ENTER();

	DGLES2_ERROR_IF(ctx->hgl.IsShader(program), GL_INVALID_OPERATION);

	DGLES2_ERROR_IF(!ctx->hgl.IsProgram(program), GL_INVALID_VALUE);

	DGLES2_ERROR_IF(ctx->hgl.IsProgram(shader), GL_INVALID_OPERATION);

	DGLES2_ERROR_IF(!ctx->hgl.IsShader(shader), GL_INVALID_VALUE);

	ctx->hgl.DetachShader(program, shader);

	DGLES2_LEAVE();

}

GL_APICALL_BUILD void GL_APIENTRY glGetActiveAttrib (GLuint program, GLuint index, GLsizei bufsize, GLsizei* length, GLint* size, GLenum* type, char* name)

{

	DGLES2_ENTER();

	DGLES2_ERROR_IF(ctx->hgl.IsShader(program), GL_INVALID_OPERATION);

	DGLES2_ERROR_IF(!ctx->hgl.IsProgram(program), GL_INVALID_VALUE);

	ctx->hgl.GetActiveAttrib(program, index, bufsize, length, size, type, name);

	DGLES2_LEAVE();

}

GL_APICALL_BUILD void GL_APIENTRY glGetActiveUniform (GLuint program, GLuint index, GLsizei bufsize, GLsizei* length, GLint* size, GLenum* type, char* name)

{

	DGLES2_ENTER();

	DGLES2_ERROR_IF(ctx->hgl.IsShader(program), GL_INVALID_OPERATION);

	DGLES2_ERROR_IF(!ctx->hgl.IsProgram(program), GL_INVALID_VALUE);

	ctx->hgl.GetActiveUniform(program, index, bufsize, length, size, type, name);

	DGLES2_LEAVE();

}

GL_APICALL_BUILD void GL_APIENTRY glGetAttachedShaders (GLuint program, GLsizei maxcount, GLsizei* count, GLuint* shaders)

{

	DGLES2_ENTER();

	DGLES2_ERROR_IF(ctx->hgl.IsShader(program), GL_INVALID_OPERATION);

	DGLES2_ERROR_IF(!ctx->hgl.IsProgram(program), GL_INVALID_VALUE);

	ctx->hgl.GetAttachedShaders(program, maxcount, count, shaders);

	DGLES2_LEAVE();

}

GL_APICALL_BUILD int GL_APIENTRY glGetAttribLocation (GLuint program, const char* name)

{

	DGLES2_ENTER_RET(-1);

	DGLES2_ERROR_IF_RET(ctx->hgl.IsShader(program), GL_INVALID_OPERATION, -1);

	DGLES2_ERROR_IF_RET(!ctx->hgl.IsProgram(program), GL_INVALID_VALUE, -1);

	DGLES2_LEAVE_RET(ctx->hgl.GetAttribLocation(program, name););

}

GL_APICALL_BUILD void GL_APIENTRY glGetProgramiv(GLuint program, GLenum pname, GLint* params)

{

	DGLES2_ENTER();

	DGLES2_ERROR_IF(ctx->hgl.IsShader(program), GL_INVALID_OPERATION);

	DGLES2_ERROR_IF(!ctx->hgl.IsProgram(program), GL_INVALID_VALUE);

	switch(pname)

	{

		case GL_LINK_STATUS:

			{

				const DGLProgram* program_obj = DGLContext_findProgram(ctx, program);

				DGLES2_ASSERT(program_obj != NULL);

				if(program_obj->link_status)

				{

					// Our requirement for linking was fulfilled, ask the host.

					ctx->hgl.GetProgramiv(program, GL_LINK_STATUS, params);

				}

				else

				{

					*params = GL_FALSE;

				}

			}

			break;

		case GL_VALIDATE_STATUS:

			{

				const DGLProgram* program_obj = DGLContext_findProgram(ctx, program);

				DGLES2_ASSERT(program_obj != NULL);

				if(program_obj->validate_status)

				{

					// Our requirement for validation was fulfilled, ask the host.

					ctx->hgl.GetProgramiv(program, GL_VALIDATE_STATUS, params);

				}

				else

				{

					*params = GL_FALSE;

				}

			}

			break;

		case GL_INFO_LOG_LENGTH:

			{

				const DGLProgram* program_obj = DGLContext_findProgram(ctx, program);

				DGLES2_ASSERT(program_obj != NULL);

				if(!program_obj->link_status || !program_obj->validate_status)

				{

					// Use our own info log.

					*params = strlen(DGLES2_INFO_LOG_INVALID_SHADERS);

				}

				else

				{

					ctx->hgl.GetProgramiv(program, GL_INFO_LOG_LENGTH, params);

				}

			}

			break;

		default:

			ctx->hgl.GetProgramiv(program, pname, params);

			break;

	}

	DGLES2_LEAVE();

}

GL_APICALL_BUILD void GL_APIENTRY glGetProgramInfoLog(GLuint program, GLsizei bufsize, GLsizei* length, char* infolog)

{

	DGLES2_ENTER();

	DGLES2_ERROR_IF(ctx->hgl.IsShader(program), GL_INVALID_OPERATION);

	DGLES2_ERROR_IF(!ctx->hgl.IsProgram(program), GL_INVALID_VALUE);

	{

		const DGLProgram* program_obj = DGLContext_findProgram(ctx, program);

		DGLES2_ASSERT(program_obj != NULL);

		if(!program_obj->link_status || !program_obj->validate_status)

		{

			// Use our own info log.

			if(length != NULL)

			{

				*length = 0;

			}

			if(infolog != NULL)

			{

				int log_length = strlen(DGLES2_INFO_LOG_INVALID_SHADERS);

				int num_chars = log_length < bufsize - 1 ? log_length : bufsize - 1;

				strncpy(infolog, DGLES2_INFO_LOG_INVALID_SHADERS, num_chars);

				infolog[num_chars] = 0;

				if(length != NULL)

				{

					*length = num_chars;

				}

			}

		}

		else

		{

			ctx->hgl.GetProgramInfoLog(program, bufsize, length, infolog);

		}

	}

	DGLES2_LEAVE();

}

GL_APICALL_BUILD void GL_APIENTRY glGetUniformfv(GLuint program, GLint location, GLfloat* params)

{

	DGLES2_ENTER();

	DGLES2_ERROR_IF(ctx->hgl.IsShader(program), GL_INVALID_OPERATION);

	DGLES2_ERROR_IF(!ctx->hgl.IsProgram(program), GL_INVALID_VALUE);

	ctx->hgl.GetUniformfv(program, location, params);

	DGLES2_LEAVE();

}

GL_APICALL_BUILD void GL_APIENTRY glGetUniformiv(GLuint program, GLint location, GLint* params)

{

	DGLES2_ENTER();

	DGLES2_ERROR_IF(ctx->hgl.IsShader(program), GL_INVALID_OPERATION);

	DGLES2_ERROR_IF(!ctx->hgl.IsProgram(program), GL_INVALID_VALUE);

	ctx->hgl.GetUniformiv(program, location, params);

	DGLES2_LEAVE();

}

GL_APICALL_BUILD int GL_APIENTRY glGetUniformLocation(GLuint program, const char* name)

{

	DGLES2_ENTER_RET(-1);

	DGLES2_ERROR_IF_RET(ctx->hgl.IsShader(program), GL_INVALID_OPERATION, -1);

	DGLES2_ERROR_IF_RET(!ctx->hgl.IsProgram(program), GL_INVALID_VALUE, -1);

	DGLES2_LEAVE_RET(ctx->hgl.GetUniformLocation(program, name));

}

GL_APICALL_BUILD GLboolean GL_APIENTRY glIsProgram(GLuint program)

{

	DGLES2_ENTER_RET(GL_FALSE);

	DGLES2_LEAVE_RET(ctx->hgl.IsProgram(program));

}

GL_APICALL_BUILD void GL_APIENTRY glLinkProgram(GLuint program)

{

	DGLES2_ENTER();

	DGLES2_ERROR_IF(ctx->hgl.IsShader(program), GL_INVALID_OPERATION);

	DGLES2_ERROR_IF(!ctx->hgl.IsProgram(program), GL_INVALID_VALUE);

	{

		GLint num_shaders;

		DGLProgram* program_obj = DGLContext_findProgram(ctx, program);

		DGLES2_ASSERT(program_obj != NULL);

		ctx->hgl.GetProgramiv(program, GL_ATTACHED_SHADERS, &num_shaders);

		// Linked programs must have both a vertex and a fragment shader in GL ES.

		// Multiple shaders of the same type may not be attached to a single program object.

		if(num_shaders != 2)

		{

			program_obj->link_status = GL_FALSE;

		}

		else

		{

			// Check that the shaders are of different type.

			GLuint shaders[2];

			GLint types[2];

			ctx->hgl.GetAttachedShaders(program, 2, NULL, shaders);

			ctx->hgl.GetShaderiv(shaders[0], GL_SHADER_TYPE, &types[0]);

			ctx->hgl.GetShaderiv(shaders[1], GL_SHADER_TYPE, &types[1]);

			if(types[0] == types[1])

			{

				program_obj->link_status = GL_FALSE;

			}

			else

			{

				program_obj->link_status = GL_TRUE;

				ctx->hgl.LinkProgram(program);

			}

		}

	}

	DGLES2_LEAVE();

}

GL_APICALL_BUILD void GL_APIENTRY glUniform1f (GLint location, GLfloat x)

{

	DGLES2_ENTER();

	ctx->hgl.Uniform1f(location, x);

	DGLES2_LEAVE();

}

GL_APICALL_BUILD void GL_APIENTRY glUniform1fv (GLint location, GLsizei count, const GLfloat* v)

{

	DGLES2_ENTER();

	ctx->hgl.Uniform1fv(location, count, v);

	DGLES2_LEAVE();

}

GL_APICALL_BUILD void GL_APIENTRY glUniform1i (GLint location, GLint x)

{

	DGLES2_ENTER();

	ctx->hgl.Uniform1i(location, x);

	DGLES2_LEAVE();

}

GL_APICALL_BUILD void GL_APIENTRY glUniform1iv (GLint location, GLsizei count, const GLint* v)

{

	DGLES2_ENTER();

	ctx->hgl.Uniform1iv(location, count, v);

	DGLES2_LEAVE();

}

GL_APICALL_BUILD void GL_APIENTRY glUniform2f (GLint location, GLfloat x, GLfloat y)

{

	DGLES2_ENTER();

	ctx->hgl.Uniform2f(location, x, y);

	DGLES2_LEAVE();

}

GL_APICALL_BUILD void GL_APIENTRY glUniform2fv (GLint location, GLsizei count, const GLfloat* v)

{

	DGLES2_ENTER();

	ctx->hgl.Uniform2fv(location, count, v);

	DGLES2_LEAVE();

}

GL_APICALL_BUILD void GL_APIENTRY glUniform2i (GLint location, GLint x, GLint y)

{

	DGLES2_ENTER();

	ctx->hgl.Uniform2i(location, x, y);

	DGLES2_LEAVE();

}

GL_APICALL_BUILD void GL_APIENTRY glUniform2iv (GLint location, GLsizei count, const GLint* v)

{

	DGLES2_ENTER();

	ctx->hgl.Uniform2iv(location, count, v);

	DGLES2_LEAVE();

}

GL_APICALL_BUILD void GL_APIENTRY glUniform3f (GLint location, GLfloat x, GLfloat y, GLfloat z)

{

	DGLES2_ENTER();

	ctx->hgl.Uniform3f(location, x, y, z);

	DGLES2_LEAVE();

}

GL_APICALL_BUILD void GL_APIENTRY glUniform3fv (GLint location, GLsizei count, const GLfloat* v)

{

	DGLES2_ENTER();

	ctx->hgl.Uniform3fv(location, count, v);

	DGLES2_LEAVE();

}

GL_APICALL_BUILD void GL_APIENTRY glUniform3i (GLint location, GLint x, GLint y, GLint z)

{

	DGLES2_ENTER();

	ctx->hgl.Uniform3i(location, x, y, z);

	DGLES2_LEAVE();

}

GL_APICALL_BUILD void GL_APIENTRY glUniform3iv (GLint location, GLsizei count, const GLint* v)

{

	DGLES2_ENTER();

	ctx->hgl.Uniform3iv(location, count, v);

	DGLES2_LEAVE();

}

GL_APICALL_BUILD void GL_APIENTRY glUniform4f (GLint location, GLfloat x, GLfloat y, GLfloat z, GLfloat w)

{

	DGLES2_ENTER();

	ctx->hgl.Uniform4f(location, x, y, z, w);

	DGLES2_LEAVE();

}

GL_APICALL_BUILD void GL_APIENTRY glUniform4fv (GLint location, GLsizei count, const GLfloat* v)

{

	DGLES2_ENTER();

	ctx->hgl.Uniform4fv(location, count, v);

	DGLES2_LEAVE();

}

GL_APICALL_BUILD void GL_APIENTRY glUniform4i (GLint location, GLint x, GLint y, GLint z, GLint w)

{

	DGLES2_ENTER();

	ctx->hgl.Uniform4i(location, x, y, z, w);

	DGLES2_LEAVE();

}

GL_APICALL_BUILD void GL_APIENTRY glUniform4iv (GLint location, GLsizei count, const GLint* v)

{

	DGLES2_ENTER();

	ctx->hgl.Uniform4iv(location, count, v);

	DGLES2_LEAVE();

}

GL_APICALL_BUILD void GL_APIENTRY glUniformMatrix2fv (GLint location, GLsizei count, GLboolean transpose, const GLfloat* value)

{

	DGLES2_ENTER();

	ctx->hgl.UniformMatrix2fv(location, count, transpose, value);

	DGLES2_LEAVE();

}

GL_APICALL_BUILD void GL_APIENTRY glUniformMatrix3fv (GLint location, GLsizei count, GLboolean transpose, const GLfloat* value)

{

	DGLES2_ENTER();

	ctx->hgl.UniformMatrix3fv(location, count, transpose, value);

	DGLES2_LEAVE();

}

GL_APICALL_BUILD void GL_APIENTRY glUniformMatrix4fv (GLint location, GLsizei count, GLboolean transpose, const GLfloat* value)

{

	DGLES2_ENTER();

	ctx->hgl.UniformMatrix4fv(location, count, transpose, value);

	DGLES2_LEAVE();

}

GL_APICALL_BUILD void GL_APIENTRY glUseProgram (GLuint program)

{

	DGLES2_ENTER();

	ctx->hgl.UseProgram(program);

	DGLES2_LEAVE();

}

GL_APICALL_BUILD void GL_APIENTRY glValidateProgram (GLuint program)

{

	DGLES2_ENTER();

	DGLES2_ERROR_IF(ctx->hgl.IsShader(program), GL_INVALID_OPERATION);

	DGLES2_ERROR_IF(!ctx->hgl.IsProgram(program), GL_INVALID_VALUE);

	{

		GLint num_shaders;

		DGLProgram* program_obj = DGLContext_findProgram(ctx, program);

		DGLES2_ASSERT(program_obj != NULL);

		// The program must no be empty.

		ctx->hgl.GetProgramiv(program, GL_ATTACHED_SHADERS, &num_shaders);

		if(num_shaders == 0)

		{

			program_obj->validate_status = GL_FALSE;

		}

		else

		{

			program_obj->validate_status = GL_TRUE;

			ctx->hgl.ValidateProgram(program);

		}

	}

	DGLES2_LEAVE();

}