// Copyright (C) 2008 Christian Stehno
// Heavily based on the OpenGL driver implemented by Nikolaus Gebhardt
// This file is part of the "Irrlicht Engine".
// For conditions of distribution and use, see copyright notice in Irrlicht.h

#include "IrrCompileConfig.h"

#ifdef _IRR_COMPILE_WITH_OGLES1_

#include "COGLESExtensionHandler.h"
#include "COGLESDriver.h"
#include "fast_atof.h"
#include "irrString.h"

namespace irr
{
namespace video
{

	static const char* const OGLESFeatureStrings[] =
	{
		"GL_AMD_compressed_3DC_texture",
		"GL_AMD_compressed_ATC_texture",
		"GL_AMD_performance_monitor",
		"GL_AMD_program_binary_Z400",
		"GL_ANGLE_framebuffer_blit",
		"GL_ANGLE_framebuffer_multisample",
		"GL_APPLE_copy_texture_levels",
		"GL_APPLE_framebuffer_multisample",
		"GL_APPLE_rgb_422",
		"GL_APPLE_sync",
		"GL_APPLE_texture_2D_limited_npot",
		"GL_APPLE_texture_format_BGRA8888",
		"GL_APPLE_texture_max_level",
		"GL_ARB_texture_env_combine",
		"GL_ARB_texture_env_dot3",
		"GL_ARM_mali_shader_binary",
		"GL_ARM_rgba8",
		"GL_DMP_shader_binary",
		"GL_EXT_blend_minmax",
		"GL_EXT_discard_framebuffer",
		"GL_EXT_frag_depth",
		"GL_EXT_map_buffer_range",
		"GL_EXT_multi_draw_arrays",
		"GL_EXT_multisampled_render_to_texture",
		"GL_EXT_read_format_bgra",
		"GL_EXT_robustness",
		"GL_EXT_shader_texture_lod",
		"GL_EXT_sRGB",
		"GL_EXT_texture_compression_dxt1",
		"GL_EXT_texture_filter_anisotropic",
		"GL_EXT_texture_format_BGRA8888",
		"GL_EXT_texture_lod_bias",
		"GL_EXT_texture_storage",
		"GL_EXT_texture_type_2_10_10_10_REV",
		"GL_IMG_multisampled_render_to_texture",
		"GL_IMG_program_binary",
		"GL_IMG_read_format",
		"GL_IMG_shader_binary",
		"GL_IMG_texture_compression_pvrtc",
		"GL_IMG_texture_env_enhanced_fixed_function",
		"GL_IMG_texture_format_BGRA8888",
		"GL_IMG_user_clip_plane",
		"GL_IMG_vertex_program",
		"GL_NV_coverage_sample",
		"GL_NV_depth_nonlinear",
		"GL_NV_fence",
		"GL_OES_blend_equation_separate",
		"GL_OES_blend_func_separate",
		"GL_OES_blend_subtract",
		"GL_OES_byte_coordinates",
		"GL_OES_compressed_ETC1_RGB8_texture",
		"GL_OES_compressed_paletted_texture",
		"GL_OES_depth24",
		"GL_OES_depth32",
		"GL_OES_depth_texture",
		"GL_OES_draw_texture",
		"GL_OES_EGL_image",
		"GL_OES_EGL_image_external",
		"GL_OES_EGL_sync",
		"GL_OES_element_index_uint",
		"GL_OES_extended_matrix_palette",
		"GL_OES_fbo_render_mipmap",
		"GL_OES_fixed_point",
		"GL_OES_fragment_precision_high",
		"GL_OES_framebuffer_object",
		"GL_OES_get_program_binary",
		"GL_OES_mapbuffer",
		"GL_OES_matrix_get",
		"GL_OES_matrix_palette",
		"GL_OES_packed_depth_stencil",
		"GL_OES_point_size_array",
		"GL_OES_point_sprite",
		"GL_OES_query_matrix",
		"GL_OES_read_format",
		"GL_OES_required_internalformat",
		"GL_OES_rgb8_rgba8",
		"GL_OES_single_precision",
		"GL_OES_standard_derivatives",
		"GL_OES_stencil1",
		"GL_OES_stencil4",
		"GL_OES_stencil8",
		"GL_OES_stencil_wrap",
		"GL_OES_texture_3D",
		"GL_OES_texture_cube_map",
		"GL_OES_texture_env_crossbar",
		"GL_OES_texture_float",
		"GL_OES_texture_float_linear",
		"GL_OES_texture_half_float",
		"GL_OES_texture_half_float_linear",
		"GL_OES_texture_mirrored_repeat",
		"GL_OES_texture_npot",
		"GL_OES_vertex_array_object",
		"GL_OES_vertex_half_float",
		"GL_OES_vertex_type_10_10_10_2",
		"GL_QCOM_driver_control",
		"GL_QCOM_extended_get",
		"GL_QCOM_extended_get2",
		"GL_QCOM_performance_monitor_global_mode",
		"GL_QCOM_tiled_rendering",
		"GL_QCOM_writeonly_rendering",
		"GL_SUN_multi_draw_arrays",
		"GL_VIV_shader_binary"
	};


COGLES1ExtensionHandler::COGLES1ExtensionHandler() : 
#if defined(_IRR_OGLES1_USE_EXTPOINTER_)
		pGlDrawTexiOES(0), pGlDrawTexfOES(0),
		pGlDrawTexivOES(0), pGlDrawTexfvOES(0),
		pGlBlendEquationOES(0), pGlBlendFuncSeparateOES(0),
		pGlBindRenderbufferOES(0), pGlDeleteRenderbuffersOES(0),
		pGlGenRenderbuffersOES(0), pGlRenderbufferStorageOES(0),
		pGlBindFramebufferOES(0), pGlDeleteFramebuffersOES(0),
		pGlGenFramebuffersOES(0), pGlCheckFramebufferStatusOES(0),
		pGlFramebufferRenderbufferOES(0), pGlFramebufferTexture2DOES(0),
		pGlGenerateMipMapOES(0),
#endif
	Version(0), MaxTextureUnits(0), MaxLights(0),
	MaxAnisotropy(1), MaxUserClipPlanes(0), MaxAuxBuffers(0),
	MaxMultipleRenderTargets(1), MaxIndices(65535), MaxTextureSize(1),
	MaxTextureLODBias(0.f), CommonProfile(false),
	MultiTextureExtension(false), MultiSamplingExtension(false),
	StencilBuffer(false)
{
	for (u32 i=0; i<IRR_OGLES_Feature_Count; ++i)
		FeatureAvailable[i]=false;
	DimAliasedLine[0]=1.f;
	DimAliasedLine[1]=1.f;
	DimAliasedPoint[0]=1.f;
	DimAliasedPoint[1]=1.f;
	DimSmoothedLine[0]=1.f;
	DimSmoothedLine[1]=1.f;
	DimSmoothedPoint[0]=1.f;
	DimSmoothedPoint[1]=1.f;
}


void COGLES1ExtensionHandler::dump() const
{
	for (u32 i=0; i<IRR_OGLES_Feature_Count; ++i)
		os::Printer::log(OGLESFeatureStrings[i], FeatureAvailable[i]?" true":" false");
}


void COGLES1ExtensionHandler::initExtensions(COGLES1Driver* driver, bool withStencil)
{
	const core::stringc stringVer(glGetString(GL_VERSION));
	CommonProfile = (stringVer[11]=='M');
	const f32 ogl_ver = core::fast_atof(stringVer.c_str()+13);
	Version = static_cast<u16>(core::floor32(ogl_ver)*100+core::round32(core::fract(ogl_ver)*10.0f));
	core::stringc extensions = glGetString(GL_EXTENSIONS);
	os::Printer::log(extensions.c_str());

	// typo in the simulator (note the postfixed s)
	if (extensions.find("GL_IMG_user_clip_planes"))
			FeatureAvailable[IRR_IMG_user_clip_plane] = true;

	{
		const u32 size = extensions.size()+1;
		c8* str = new c8[size];
		strncpy(str, extensions.c_str(), extensions.size());
		str[extensions.size()]=' ';
		c8* p = str;

		for (u32 i=0; i<size; ++i)
		{
			if (str[i] == ' ')
			{
				str[i] = 0;
				if (*p)
				for (u32 j=0; j<IRR_OGLES_Feature_Count; ++j)
				{
					if (!strcmp(OGLESFeatureStrings[j], p))
					{
						FeatureAvailable[j] = true;
						break;
					}
				}

				p = p + strlen(p) + 1;
			}
		}

		delete [] str;
	}

	GLint val=0;
	glGetIntegerv(GL_MAX_TEXTURE_UNITS, &val);
	MaxSupportedTextures = core::min_(MATERIAL_MAX_TEXTURES, static_cast<u32>(val));
	MultiTextureExtension = true;
	glGetIntegerv(GL_MAX_LIGHTS, &val);
	MaxLights = static_cast<u8>(val);
#ifdef GL_EXT_texture_filter_anisotropic
	if (FeatureAvailable[IRR_EXT_texture_filter_anisotropic])
	{
		glGetIntegerv(GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT, &val);
		MaxAnisotropy = static_cast<u8>(val);
	}
#endif
#ifdef GL_MAX_ELEMENTS_INDICES
	glGetIntegerv(GL_MAX_ELEMENTS_INDICES, &val);
	MaxIndices=val;
#endif
	glGetIntegerv(GL_MAX_TEXTURE_SIZE, &val);
	MaxTextureSize=static_cast<u32>(val);
#ifdef GL_EXT_texture_lod_bias
	if (FeatureAvailable[IRR_EXT_texture_lod_bias])
		glGetFloatv(GL_MAX_TEXTURE_LOD_BIAS_EXT, &MaxTextureLODBias);
#endif
	if ((Version>100) || FeatureAvailable[IRR_IMG_user_clip_plane])
	{
		glGetIntegerv(GL_MAX_CLIP_PLANES, &val);
		MaxUserClipPlanes = static_cast<u8>(val);
	}
	glGetFloatv(GL_ALIASED_LINE_WIDTH_RANGE, DimAliasedLine);
	glGetFloatv(GL_ALIASED_POINT_SIZE_RANGE, DimAliasedPoint);
	glGetFloatv(GL_SMOOTH_LINE_WIDTH_RANGE, DimSmoothedLine);
	glGetFloatv(GL_SMOOTH_POINT_SIZE_RANGE, DimSmoothedPoint);

	MaxTextureUnits = core::min_(MaxSupportedTextures, static_cast<u8>(MATERIAL_MAX_TEXTURES));

#if defined(_IRR_OGLES1_USE_EXTPOINTER_)
#if defined(_IRR_COMPILE_WITH_X11_DEVICE_) || defined(_IRR_WINDOWS_API_) || defined(_IRR_COMPILE_WITH_ANDROID_DEVICE_)
	if (FeatureAvailable[IRR_OES_draw_texture])
	{
		pGlDrawTexiOES = (PFNGLDRAWTEXIOES) eglGetProcAddress("glDrawTexiOES");
		pGlDrawTexfOES = (PFNGLDRAWTEXFOES) eglGetProcAddress("glDrawTexfOES");
		pGlDrawTexivOES = (PFNGLDRAWTEXIVOES) eglGetProcAddress("glDrawTexivOES");
		pGlDrawTexfvOES = (PFNGLDRAWTEXFVOES) eglGetProcAddress("glDrawTexfvOES");
	}
	if (FeatureAvailable[IRR_OES_blend_subtract])
	{
		pGlBlendEquationOES = (PFNGLBLENDEQUATIONOESPROC) eglGetProcAddress("glBlendEquationOES");
	}
	if (FeatureAvailable[IRR_OES_blend_func_separate])
	{
		pGlBlendFuncSeparateOES = (PFNGLBLENDFUNCSEPARATEOESPROC) eglGetProcAddress("glBlendFuncSeparateOES");
	}
	if (FeatureAvailable[IRR_OES_framebuffer_object])
	{
		pGlBindRenderbufferOES = (PFNGLBINDRENDERBUFFEROES) eglGetProcAddress("glBindRenderbufferOES");
		pGlDeleteRenderbuffersOES = (PFNGLDELETERENDERBUFFERSOES) eglGetProcAddress("glDeletedRenderbuffersOES");
		pGlGenRenderbuffersOES = (PFNGLGENRENDERBUFFERSOES) eglGetProcAddress("glGenRenderbuffersOES");
		pGlRenderbufferStorageOES = (PFNGLRENDERBUFFERSTORAGEOES) eglGetProcAddress("glRenderbufferStorageOES");
		pGlBindFramebufferOES = (PFNGLBINDFRAMEBUFFEROES) eglGetProcAddress("glBindFramebufferOES");
		pGlDeleteFramebuffersOES = (PFNGLDELETEFRAMEBUFFERSOES) eglGetProcAddress("glDeleteFramebuffersOES");
		pGlGenFramebuffersOES = (PFNGLGENFRAMEBUFFERSOES) eglGetProcAddress("glGenFramebuffersOES");
		pGlCheckFramebufferStatusOES = (PFNGLCHECKFRAMEBUFFERSTATUSOES) eglGetProcAddress("glCheckFramebufferStatusOES");
		pGlFramebufferRenderbufferOES = (PFNGLFRAMEBUFFERRENDERBUFFEROES) eglGetProcAddress("glFramebufferRenderbufferOES");
		pGlFramebufferTexture2DOES = (PFNGLFRAMEBUFFERTEXTURE2DOES) eglGetProcAddress("glFramebufferTexture2DOES");
		pGlGenerateMipMapOES = (PFNGLGENERATEMIPMAPOES) eglGetProcAddress("glGenerateMipMapOES");
	}
#endif
#endif
}

} // end namespace video
} // end namespace irr


#endif // _IRR_COMPILE_WITH_OGLES1_
