<commit_before>// Copyright 2016 <NAME>
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package graphics

import (
	"fmt"

	"github.com/hajimehoshi/ebiten/internal/affine"
	emath "github.com/hajimehoshi/ebiten/internal/math"
	"github.com/hajimehoshi/ebiten/internal/opengl"
)

// command represents a drawing command.
//
// A command for drawing that is created when Image functions are called like DrawImage,
// or Fill.
// A command is not immediately executed after created. Instaed, it is queued after created,
// and executed only when necessary.
type command interface {
	Exec(indexOffsetInBytes int) error
	NumVertices() int
	AddNumVertices(n int)
	CanMerge(dst, src *Image, color *affine.ColorM, mode opengl.CompositeMode, filter Filter) bool
}

// commandQueue is a command queue for drawing commands.
type commandQueue struct {
	// commands is a queue of drawing commands.
	commands []command

	// vertices represents a vertices data in OpenGL's array buffer.
	vertices []float32

	// nvertices represents the current length of vertices.
	// nvertices must <= len(vertices).
	// vertices is never shrunk since re-extending a vertices buffer is heavy.
	nvertices int
}

// theCommandQueue is the command queue for the current process.
var theCommandQueue = &commandQueue{}

// appendVertices appends vertices to the queue.
func (q *commandQueue) appendVertices(vertices []float32) {
	if len(q.vertices) < q.nvertices+len(vertices) {
		n := q.nvertices + len(vertices) - len(q.vertices)
		q.vertices = append(q.vertices, make([]float32, n)...)
	}
	// for-loop might be faster than copy:
	// On GopherJS, copy might cause subarray calls.
	for i := 0; i < len(vertices); i++ {
		q.vertices[q.nvertices+i] = vertices[i]
	}
	q.nvertices += len(vertices)
}

// EnqueueDrawImageCommand enqueues a drawing-image command.
func (q *commandQueue) EnqueueDrawImageCommand(dst, src *Image, vertices []float32, color *affine.ColorM, mode opengl.CompositeMode, filter Filter) {
	// Avoid defer for performance
	q.appendVertices(vertices)
	if 0 < len(q.commands) {
		last := q.commands[len(q.commands)-1]
		if last.CanMerge(dst, src, color, mode, filter) {
			last.AddNumVertices(len(vertices))
			return
		}
	}
	c := &drawImageCommand{
		dst:       dst,
		src:       src,
		nvertices: len(vertices),
		color:     color,
		mode:      mode,
		filter:    filter,
	}
	q.commands = append(q.commands, c)
}

// Enqueue enqueues a drawing command other than a draw-image command.
//
// For a draw-image command, use EnqueueDrawImageCommand.
func (q *commandQueue) Enqueue(command command) {
	q.commands = append(q.commands, command)
}

// commandGroups separates q.commands into some groups.
// The number of quads of drawImageCommand in one groups must be equal to or less than
// its limit (maxQuads).
func (q *commandQueue) commandGroups() [][]command {
	cs := q.commands
	var gs [][]command
	quads := 0
	for 0 < len(cs) {
		if len(gs) == 0 {
			gs = append(gs, []command{})
		}
		c := cs[0]
		switch c := c.(type) {
		case *drawImageCommand:
			if maxQuads >= quads+c.quadsNum() {
				quads += c.quadsNum()
				break
			}
			cc := c.split(maxQuads - quads)
			gs[len(gs)-1] = append(gs[len(gs)-1], cc[0])
			cs[0] = cc[1]
			quads = 0
			gs = append(gs, []command{})
			continue
		}
		gs[len(gs)-1] = append(gs[len(gs)-1], c)
		cs = cs[1:]
	}
	return gs
}

// Flush flushes the command queue.
func (q *commandQueue) Flush() error {
	// glViewport must be called at least at every frame on iOS.
	opengl.GetContext().ResetViewportSize()
	n := 0
	lastN := 0
	for _, g := range q.commandGroups() {
		for _, c := range g {
			n += c.NumVertices()
		}
		if 0 < n-lastN {
			// Note that the vertices passed to BufferSubData is not under GC management
			// in opengl package due to unsafe-way.
			// See BufferSubData in context_mobile.go.
			opengl.GetContext().BufferSubData(opengl.ArrayBuffer, q.vertices[lastN:n])
		}
		// NOTE: WebGL doesn't seem to have Check gl.MAX_ELEMENTS_VERTICES or gl.MAX_ELEMENTS_INDICES so far.
		// Let's use them to compare to len(quads) in the future.
		if maxQuads < (n-lastN)*opengl.Float.SizeInBytes()/QuadVertexSizeInBytes() {
			return fmt.Errorf("len(quads) must be equal to or less than %d", maxQuads)
		}
		numc := len(g)
		indexOffsetInBytes := 0
		var lastC command
		for _, c := range g {
			// On MacBook Pro (2013 Late?), glTexSubImage2D might not be finished
			// before the next different comand. Call glFlush explicitly.
			if _, ok := lastC.(*replacePixelsCommand); ok {
				if _, ok := c.(*replacePixelsCommand); !ok {
					opengl.GetContext().Flush()
				}
			}
			lastC = c

			if err := c.Exec(indexOffsetInBytes); err != nil {
				return err
			}
			n := c.NumVertices() * opengl.Float.SizeInBytes() / QuadVertexSizeInBytes()
			indexOffsetInBytes += 6 * n * 2
		}
		if 0 < numc {
			// Call glFlush to prevent black flicking (especially on Android (#226) and iOS).
			opengl.GetContext().Flush()
		}
		lastN = n
	}
	q.commands = nil
	q.nvertices = 0
	return nil
}

// FlushCommands flushes the command queue.<commit_msg>Revert "graphics: Call glFlush after glTexSubImage2D for MacBook Pro"<commit_after>// Copyright 2016 <NAME>
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package graphics

import (
	"fmt"

	"github.com/hajimehoshi/ebiten/internal/affine"
	emath "github.com/hajimehoshi/ebiten/internal/math"
	"github.com/hajimehoshi/ebiten/internal/opengl"
)

// command represents a drawing command.
//
// A command for drawing that is created when Image functions are called like DrawImage,
// or Fill.
// A command is not immediately executed after created. Instaed, it is queued after created,
// and executed only when necessary.
type command interface {
	Exec(indexOffsetInBytes int) error
	NumVertices() int
	AddNumVertices(n int)
	CanMerge(dst, src *Image, color *affine.ColorM, mode opengl.CompositeMode, filter Filter) bool
}

// commandQueue is a command queue for drawing commands.
type commandQueue struct {
	// commands is a queue of drawing commands.
	commands []command

	// vertices represents a vertices data in OpenGL's array buffer.
	vertices []float32

	// nvertices represents the current length of vertices.
	// nvertices must <= len(vertices).
	// vertices is never shrunk since re-extending a vertices buffer is heavy.
	nvertices int
}

// theCommandQueue is the command queue for the current process.
var theCommandQueue = &commandQueue{}

// appendVertices appends vertices to the queue.
func (q *commandQueue) appendVertices(vertices []float32) {
	if len(q.vertices) < q.nvertices+len(vertices) {
		n := q.nvertices + len(vertices) - len(q.vertices)
		q.vertices = append(q.vertices, make([]float32, n)...)
	}
	// for-loop might be faster than copy:
	// On GopherJS, copy might cause subarray calls.
	for i := 0; i < len(vertices); i++ {
		q.vertices[q.nvertices+i] = vertices[i]
	}
	q.nvertices += len(vertices)
}

// EnqueueDrawImageCommand enqueues a drawing-image command.
func (q *commandQueue) EnqueueDrawImageCommand(dst, src *Image, vertices []float32, color *affine.ColorM, mode opengl.CompositeMode, filter Filter) {
	// Avoid defer for performance
	q.appendVertices(vertices)
	if 0 < len(q.commands) {
		last := q.commands[len(q.commands)-1]
		if last.CanMerge(dst, src, color, mode, filter) {
			last.AddNumVertices(len(vertices))
			return
		}
	}
	c := &drawImageCommand{
		dst:       dst,
		src:       src,
		nvertices: len(vertices),
		color:     color,
		mode:      mode,
		filter:    filter,
	}
	q.commands = append(q.commands, c)
}

// Enqueue enqueues a drawing command other than a draw-image command.
//
// For a draw-image command, use EnqueueDrawImageCommand.
func (q *commandQueue) Enqueue(command command) {
	q.commands = append(q.commands, command)
}

// commandGroups separates q.commands into some groups.
// The number of quads of drawImageCommand in one groups must be equal to or less than
// its limit (maxQuads).
func (q *commandQueue) commandGroups() [][]command {
	cs := q.commands
	var gs [][]command
	quads := 0
	for 0 < len(cs) {
		if len(gs) == 0 {
			gs = append(gs, []command{})
		}
		c := cs[0]
		switch c := c.(type) {
		case *drawImageCommand:
			if maxQuads >= quads+c.quadsNum() {
				quads += c.quadsNum()
				break
			}
			cc := c.split(maxQuads - quads)
			gs[len(gs)-1] = append(gs[len(gs)-1], cc[0])
			cs[0] = cc[1]
			quads = 0
			gs = append(gs, []command{})
			continue
		}
		gs[len(gs)-1] = append(gs[len(gs)-1], c)
		cs = cs[1:]
	}
	return gs
}

// Flush flushes the command queue.
func (q *commandQueue) Flush() error {
	// glViewport must be called at least at every frame on iOS.
	opengl.GetContext().ResetViewportSize()
	n := 0
	lastN := 0
	for _, g := range q.commandGroups() {
		for _, c := range g {
			n += c.NumVertices()
		}
		if 0 < n-lastN {
			// Note that the vertices passed to BufferSubData is not under GC management
			// in opengl package due to unsafe-way.
			// See BufferSubData in context_mobile.go.
			opengl.GetContext().BufferSubData(opengl.ArrayBuffer, q.vertices[lastN:n])
		}
		// NOTE: WebGL doesn't seem to have Check gl.MAX_ELEMENTS_VERTICES or gl.MAX_ELEMENTS_INDICES so far.
		// Let's use them to compare to len(quads) in the future.
		if maxQuads < (n-lastN)*opengl.Float.SizeInBytes()/QuadVertexSizeInBytes() {
			return fmt.Errorf("len(quads) must be equal to or less than %d", maxQuads)
		}
		numc := len(g)
		indexOffsetInBytes := 0
		for _, c := range g {
			if err := c.Exec(indexOffsetInBytes); err != nil {
				return err
			}
			n := c.NumVertices() * opengl.Float.SizeInBytes() / QuadVertexSizeInBytes()
			indexOffsetInBytes += 6 * n * 2
		}
		if 0 < numc {
			// Call glFlush to prevent black flicking (especially on Android (#226) and iOS).
			opengl.GetContext().Flush()
		}
		lastN = n
	}
	q.commands = nil
	q.nvertices = 0
	return nil
}

// FlushCommands flushes the command queue.
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{'dir': 'git-commits-cleaned', 'id': '1435768', 'n_tokens_mistral': 3890, 'n_tokens_neox': 3610, 'n_words': 1179}