package rl

const (
	// Texture parameters (equivalent to OpenGL defines)
	TextureWrapS     = 0x2802 // GL_TEXTURE_WRAP_S
	TextureWrapT     = 0x2803 // GL_TEXTURE_WRAP_T
	TextureMagFilter = 0x2800 // GL_TEXTURE_MAG_FILTER
	TextureMinFilter = 0x2801 // GL_TEXTURE_MIN_FILTER

	TextureFilterNearest          = 0x2600 // GL_NEAREST
	TextureFilterLinear           = 0x2601 // GL_LINEAR
	TextureFilterMipNearest       = 0x2700 // GL_NEAREST_MIPMAP_NEAREST
	TextureFilterNearestMipLinear = 0x2702 // GL_NEAREST_MIPMAP_LINEAR
	TextureFilterLinearMipNearest = 0x2701 // GL_LINEAR_MIPMAP_NEAREST
	TextureFilterMipLinear        = 0x2703 // GL_LINEAR_MIPMAP_LINEAR
	TextureFilterAnisotropic      = 0x3000 // Anisotropic filter (custom identifier)
	TextureMipmapBiasRatio        = 0x4000 // Texture mipmap bias, percentage ratio (custom identifier)

	TextureWrapRepeat       = 0x2901 // GL_REPEAT
	TextureWrapClamp        = 0x812F // GL_CLAMP_TO_EDGE
	TextureWrapMirrorRepeat = 0x8370 // GL_MIRRORED_REPEAT
	TextureWrapMirrorClamp  = 0x8742 // GL_MIRROR_CLAMP_EXT

	// Matrix modes (equivalent to OpenGL)
	Modelview  = 0x1700 // GL_MODELVIEW
	Projection = 0x1701 // GL_PROJECTION
	Texture    = 0x1702 // GL_TEXTURE

	// Primitive assembly draw modes
	Lines     = 0x0001 // GL_LINES
	Triangles = 0x0004 // GL_TRIANGLES
	Quads     = 0x0007 // GL_QUADS

	// GL equivalent data types
	UnsignedByte = 0x1401 // GL_UNSIGNED_BYTE
	Float        = 0x1406 // GL_FLOAT

	// Buffer usage hint
	StreamDraw  = 0x88E0 // GL_STREAM_DRAW
	StreamRead  = 0x88E1 // GL_STREAM_READ
	StreamCopy  = 0x88E2 // GL_STREAM_COPY
	StaticDraw  = 0x88E4 // GL_STATIC_DRAW
	StaticRead  = 0x88E5 // GL_STATIC_READ
	StaticCopy  = 0x88E6 // GL_STATIC_COPY
	DynamicDraw = 0x88E8 // GL_DYNAMIC_DRAW
	DynamicRead = 0x88E9 // GL_DYNAMIC_READ
	DynamicCopy = 0x88EA // GL_DYNAMIC_COPY

	// GL Shader type
	FragmentShader = 0x8B30 // GL_FRAGMENT_SHADER
	VertexShader   = 0x8B31 // GL_VERTEX_SHADER
	ComputeShader  = 0x91B9 // GL_COMPUTE_SHADER
)

// rlVertexBuffer - Dynamic vertex buffers (position + texcoords + colors + indices arrays)
type rlVertexBuffer struct {
	elementCount int32
	vertices     []float32
	texcoords    []float32
	colors       []uint8
	indices      []uint32
	vaoId        uint32
	vboId        [4]uint32
}

// rlDrawCall - Draw call type
// NOTE: Only texture changes register a new draw, other state-change-related elements are not
// used at this moment (vaoId, shaderId, matrices), raylib just forces a batch draw call if any
// of those state-change happens (this is done in core module)
type rlDrawCall struct {
	mode            int32
	vertexCount     int32
	vertexAlignment int32
	textureId       uint32
}

// rlRenderBatch type
type rlRenderBatch struct {
	bufferCount   int32
	currentBuffer int32
	vertexBuffer  []rlVertexBuffer
	draws         []rlDrawCall
	drawCounter   int32
	currentDepth  float32
}

// OpenGL version
const (
	Opengl11   int32 = 1
	Opengl21   int32 = 2
	Opengl33   int32 = 3
	Opengl43   int32 = 4
	OpenglEs20 int32 = 5
)

type rlGlVersion = int32

// Shader attribute data types
const (
	ShaderAttribFloat int32 = 0
	ShaderAttribVec2  int32 = 1
	ShaderAttribVec3  int32 = 2
	ShaderAttribVec4  int32 = 3
)

type rlShaderAttributeDataType = int32

// Framebuffer attachment type
// NOTE: By default up to 8 color channels defined but it can be more
const (
	AttachmentColorChannel0 int32 = 0
	AttachmentColorChannel1 int32 = 1
	AttachmentColorChannel2 int32 = 2
	AttachmentColorChannel3 int32 = 3
	AttachmentColorChannel4 int32 = 4
	AttachmentColorChannel5 int32 = 5
	AttachmentColorChannel6 int32 = 6
	AttachmentColorChannel7 int32 = 7
	AttachmentDepth         int32 = 100
	AttachmentStencil       int32 = 200
)

type rlFramebufferAttachType = int32

// Framebuffer texture attachment type
const (
	AttachmentCubemapPositiveX int32 = 0
	AttachmentCubemapNegativeX int32 = 1
	AttachmentCubemapPositiveY int32 = 2
	AttachmentCubemapNegativeY int32 = 3
	AttachmentCubemapPositiveZ int32 = 4
	AttachmentCubemapNegativeZ int32 = 5
	AttachmentTexture2d        int32 = 100
	AttachmentRenderbuffer     int32 = 200
)

type rlFramebufferAttachTextureType = int32