axmol/cocos2dx/draw_nodes/CCDrawingPrimitives.cpp

/****************************************************************************
Copyright (c) 2010-2012 cocos2d-x.org
Copyright (c) 2008-2010 Ricardo Quesada
Copyright (c) 2011      Zynga Inc.

http://www.cocos2d-x.org

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
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all copies or substantial portions of the Software.

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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
****************************************************************************/

/*
 *
 * IMPORTANT       IMPORTANT        IMPORTANT        IMPORTANT
 *
 *
 * LEGACY FUNCTIONS
 *
 * USE DrawNode instead
 *
 */

#include "CCDrawingPrimitives.h"
#include "ccTypes.h"
#include "ccMacros.h"
#include "CCGL.h"
#include "CCDirector.h"
#include "shaders/ccGLStateCache.h"
#include "shaders/CCShaderCache.h"
#include "shaders/CCGLProgram.h"
#include "actions/CCActionCatmullRom.h"
#include <string.h>
#include <cmath>

NS_CC_BEGIN
#ifndef M_PI
    #define M_PI       3.14159265358979323846
#endif

namespace DrawPrimitives {

static bool s_initialized = false;
static GLProgram* s_shader = NULL;
static int s_colorLocation = -1;
static Color4F s_color(1.0f,1.0f,1.0f,1.0f);
static int s_pointSizeLocation = -1;
static GLfloat s_pointSize = 1.0f;

#ifdef EMSCRIPTEN
static GLuint s_bufferObject = 0;
static GLuint s_bufferSize = 0;

static void setGLBufferData(void *buf, GLuint bufSize)
{
    if(s_bufferSize < bufSize)
    {
        if(s_bufferObject)
        {
            glDeleteBuffers(1, &s_bufferObject);
        }
        glGenBuffers(1, &s_bufferObject);
        s_bufferSize = bufSize;

        glBindBuffer(GL_ARRAY_BUFFER, s_bufferObject);
        glBufferData(GL_ARRAY_BUFFER, bufSize, buf, GL_DYNAMIC_DRAW);
    }
    else
    {
        glBindBuffer(GL_ARRAY_BUFFER, s_bufferObject);
        glBufferSubData(GL_ARRAY_BUFFER, 0, bufSize, buf);
    }
}

#endif // EMSCRIPTEN

static void lazy_init( void )
{
    if( ! s_initialized ) {

        //
        // Position and 1 color passed as a uniform (to simulate glColor4ub )
        //
        s_shader = ShaderCache::getInstance()->programForKey(GLProgram::SHADER_NAME_POSITION_U_COLOR);
        s_shader->retain();
        
        s_colorLocation = glGetUniformLocation( s_shader->getProgram(), "u_color");
    CHECK_GL_ERROR_DEBUG();
        s_pointSizeLocation = glGetUniformLocation( s_shader->getProgram(), "u_pointSize");
    CHECK_GL_ERROR_DEBUG();

        s_initialized = true;
    }
}

// When switching from backround to foreground on android, we want the params to be initialized again
void init()
{
    lazy_init();
}

void free()
{
	CC_SAFE_RELEASE_NULL(s_shader);
	s_initialized = false;
}

void drawPoint( const Point& point )
{
    lazy_init();

    Vertex2F p;
    p.x = point.x;
    p.y = point.y;

    GL::enableVertexAttribs( GL::VERTEX_ATTRIB_FLAG_POSITION );
    s_shader->use();
    s_shader->setUniformsForBuiltins();

    s_shader->setUniformLocationWith4fv(s_colorLocation, (GLfloat*) &s_color.r, 1);
    s_shader->setUniformLocationWith1f(s_pointSizeLocation, s_pointSize);

#ifdef EMSCRIPTEN
    setGLBufferData(&p, 8);
    glVertexAttribPointer(GLProgram::VERTEX_ATTRIB_POSITION, 2, GL_FLOAT, GL_FALSE, 0, 0);
#else
    glVertexAttribPointer(GLProgram::VERTEX_ATTRIB_POSITION, 2, GL_FLOAT, GL_FALSE, 0, &p);
#endif // EMSCRIPTEN

    glDrawArrays(GL_POINTS, 0, 1);

    CC_INCREMENT_GL_DRAWS(1);
}

void drawPoints( const Point *points, unsigned int numberOfPoints )
{
    lazy_init();

    GL::enableVertexAttribs( GL::VERTEX_ATTRIB_FLAG_POSITION );
    s_shader->use();
    s_shader->setUniformsForBuiltins();
    s_shader->setUniformLocationWith4fv(s_colorLocation, (GLfloat*) &s_color.r, 1);
    s_shader->setUniformLocationWith1f(s_pointSizeLocation, s_pointSize);

    // XXX: Mac OpenGL error. arrays can't go out of scope before draw is executed
    Vertex2F* newPoints = new Vertex2F[numberOfPoints];

    // iPhone and 32-bit machines optimization
    if( sizeof(Point) == sizeof(Vertex2F) )
    {
#ifdef EMSCRIPTEN
        setGLBufferData((void*) points, numberOfPoints * sizeof(Point));
        glVertexAttribPointer(GLProgram::VERTEX_ATTRIB_POSITION, 2, GL_FLOAT, GL_FALSE, 0, 0);
#else
        glVertexAttribPointer(GLProgram::VERTEX_ATTRIB_POSITION, 2, GL_FLOAT, GL_FALSE, 0, points);
#endif // EMSCRIPTEN
    }
    else
    {
        // Mac on 64-bit
        for( unsigned int i=0; i<numberOfPoints;i++) {
            newPoints[i].x = points[i].x;
            newPoints[i].y = points[i].y;
        }
#ifdef EMSCRIPTEN
        // Suspect Emscripten won't be emitting 64-bit code for a while yet,
        // but want to make sure this continues to work even if they do.
        setGLBufferData(newPoints, numberOfPoints * sizeof(Vertex2F));
        glVertexAttribPointer(GLProgram::VERTEX_ATTRIB_POSITION, 2, GL_FLOAT, GL_FALSE, 0, 0);
#else
        glVertexAttribPointer(GLProgram::VERTEX_ATTRIB_POSITION, 2, GL_FLOAT, GL_FALSE, 0, newPoints);
#endif // EMSCRIPTEN
    }

    glDrawArrays(GL_POINTS, 0, (GLsizei) numberOfPoints);

    CC_SAFE_DELETE_ARRAY(newPoints);

    CC_INCREMENT_GL_DRAWS(1);
}


void drawLine( const Point& origin, const Point& destination )
{
    lazy_init();

    Vertex2F vertices[2] = {
        Vertex2F(origin.x, origin.y),
        Vertex2F(destination.x, destination.y)
    };

    s_shader->use();
    s_shader->setUniformsForBuiltins();
    s_shader->setUniformLocationWith4fv(s_colorLocation, (GLfloat*) &s_color.r, 1);

    GL::enableVertexAttribs( GL::VERTEX_ATTRIB_FLAG_POSITION );
#ifdef EMSCRIPTEN
    setGLBufferData(vertices, 16);
    glVertexAttribPointer(GLProgram::VERTEX_ATTRIB_POSITION, 2, GL_FLOAT, GL_FALSE, 0, 0);
#else
    glVertexAttribPointer(GLProgram::VERTEX_ATTRIB_POSITION, 2, GL_FLOAT, GL_FALSE, 0, vertices);
#endif // EMSCRIPTEN
    glDrawArrays(GL_LINES, 0, 2);

    CC_INCREMENT_GL_DRAWS(1);
}

void drawRect( Point origin, Point destination )
{
    drawLine(Point(origin.x, origin.y), Point(destination.x, origin.y));
    drawLine(Point(destination.x, origin.y), Point(destination.x, destination.y));
    drawLine(Point(destination.x, destination.y), Point(origin.x, destination.y));
    drawLine(Point(origin.x, destination.y), Point(origin.x, origin.y));
}

void drawSolidRect( Point origin, Point destination, Color4F color )
{
    Point vertices[] = {
        origin,
        Point(destination.x, origin.y),
        destination,
        Point(origin.x, destination.y)
    };

    drawSolidPoly(vertices, 4, color );
}

void drawPoly( const Point *poli, unsigned int numberOfPoints, bool closePolygon )
{
    lazy_init();

    s_shader->use();
    s_shader->setUniformsForBuiltins();
    s_shader->setUniformLocationWith4fv(s_colorLocation, (GLfloat*) &s_color.r, 1);

    GL::enableVertexAttribs( GL::VERTEX_ATTRIB_FLAG_POSITION );

    // iPhone and 32-bit machines optimization
    if( sizeof(Point) == sizeof(Vertex2F) )
    {
#ifdef EMSCRIPTEN
        setGLBufferData((void*) poli, numberOfPoints * sizeof(Point));
        glVertexAttribPointer(GLProgram::VERTEX_ATTRIB_POSITION, 2, GL_FLOAT, GL_FALSE, 0, 0);
#else
        glVertexAttribPointer(GLProgram::VERTEX_ATTRIB_POSITION, 2, GL_FLOAT, GL_FALSE, 0, poli);
#endif // EMSCRIPTEN

        if( closePolygon )
            glDrawArrays(GL_LINE_LOOP, 0, (GLsizei) numberOfPoints);
        else
            glDrawArrays(GL_LINE_STRIP, 0, (GLsizei) numberOfPoints);
    }
    else
    {
        // Mac on 64-bit
        // XXX: Mac OpenGL error. arrays can't go out of scope before draw is executed
        Vertex2F* newPoli = new Vertex2F[numberOfPoints];
        for( unsigned int i=0; i<numberOfPoints;i++) {
            newPoli[i].x = poli[i].x;
            newPoli[i].y = poli[i].y;
        }
#ifdef EMSCRIPTEN
        setGLBufferData(newPoli, numberOfPoints * sizeof(Vertex2F));
        glVertexAttribPointer(GLProgram::VERTEX_ATTRIB_POSITION, 2, GL_FLOAT, GL_FALSE, 0, 0);
#else
        glVertexAttribPointer(GLProgram::VERTEX_ATTRIB_POSITION, 2, GL_FLOAT, GL_FALSE, 0, newPoli);
#endif // EMSCRIPTEN

        if( closePolygon )
            glDrawArrays(GL_LINE_LOOP, 0, (GLsizei) numberOfPoints);
        else
            glDrawArrays(GL_LINE_STRIP, 0, (GLsizei) numberOfPoints);

        CC_SAFE_DELETE_ARRAY(newPoli);
    }

    CC_INCREMENT_GL_DRAWS(1);
}

void drawSolidPoly( const Point *poli, unsigned int numberOfPoints, Color4F color )
{
    lazy_init();

    s_shader->use();
    s_shader->setUniformsForBuiltins();
    s_shader->setUniformLocationWith4fv(s_colorLocation, (GLfloat*) &color.r, 1);

    GL::enableVertexAttribs( GL::VERTEX_ATTRIB_FLAG_POSITION );

    // XXX: Mac OpenGL error. arrays can't go out of scope before draw is executed
    Vertex2F* newPoli = new Vertex2F[numberOfPoints];

    // iPhone and 32-bit machines optimization
    if( sizeof(Point) == sizeof(Vertex2F) )
    {
#ifdef EMSCRIPTEN
        setGLBufferData((void*) poli, numberOfPoints * sizeof(Point));
        glVertexAttribPointer(GLProgram::VERTEX_ATTRIB_POSITION, 2, GL_FLOAT, GL_FALSE, 0, 0);
#else
        glVertexAttribPointer(GLProgram::VERTEX_ATTRIB_POSITION, 2, GL_FLOAT, GL_FALSE, 0, poli);
#endif // EMSCRIPTEN
    }
    else
    {
        // Mac on 64-bit
        for( unsigned int i=0; i<numberOfPoints;i++)
        {
            newPoli[i] = Vertex2F( poli[i].x, poli[i].y );
        }
#ifdef EMSCRIPTEN
        setGLBufferData(newPoli, numberOfPoints * sizeof(Vertex2F));
        glVertexAttribPointer(GLProgram::VERTEX_ATTRIB_POSITION, 2, GL_FLOAT, GL_FALSE, 0, 0);
#else
        glVertexAttribPointer(GLProgram::VERTEX_ATTRIB_POSITION, 2, GL_FLOAT, GL_FALSE, 0, newPoli);
#endif // EMSCRIPTEN
    }    

    glDrawArrays(GL_TRIANGLE_FAN, 0, (GLsizei) numberOfPoints);

    CC_SAFE_DELETE_ARRAY(newPoli);
    CC_INCREMENT_GL_DRAWS(1);
}

void drawCircle( const Point& center, float radius, float angle, unsigned int segments, bool drawLineToCenter, float scaleX, float scaleY)
{
    lazy_init();

    int additionalSegment = 1;
    if (drawLineToCenter)
        additionalSegment++;

    const float coef = 2.0f * (float)M_PI/segments;

    GLfloat *vertices = (GLfloat*)calloc( sizeof(GLfloat)*2*(segments+2), 1);
    if( ! vertices )
        return;

    for(unsigned int i = 0;i <= segments; i++) {
        float rads = i*coef;
        GLfloat j = radius * cosf(rads + angle) * scaleX + center.x;
        GLfloat k = radius * sinf(rads + angle) * scaleY + center.y;

        vertices[i*2] = j;
        vertices[i*2+1] = k;
    }
    vertices[(segments+1)*2] = center.x;
    vertices[(segments+1)*2+1] = center.y;

    s_shader->use();
    s_shader->setUniformsForBuiltins();
    s_shader->setUniformLocationWith4fv(s_colorLocation, (GLfloat*) &s_color.r, 1);

    GL::enableVertexAttribs( GL::VERTEX_ATTRIB_FLAG_POSITION );

#ifdef EMSCRIPTEN
    setGLBufferData(vertices, sizeof(GLfloat)*2*(segments+2));
    glVertexAttribPointer(GLProgram::VERTEX_ATTRIB_POSITION, 2, GL_FLOAT, GL_FALSE, 0, 0);
#else
    glVertexAttribPointer(GLProgram::VERTEX_ATTRIB_POSITION, 2, GL_FLOAT, GL_FALSE, 0, vertices);
#endif // EMSCRIPTEN
    glDrawArrays(GL_LINE_STRIP, 0, (GLsizei) segments+additionalSegment);

    ::free( vertices );

    CC_INCREMENT_GL_DRAWS(1);
}

void drawCircle( const Point& center, float radius, float angle, unsigned int segments, bool drawLineToCenter)
{
    drawCircle(center, radius, angle, segments, drawLineToCenter, 1.0f, 1.0f);
}

void drawSolidCircle( const Point& center, float radius, float angle, unsigned int segments, float scaleX, float scaleY)
{
    lazy_init();
    
    const float coef = 2.0f * (float)M_PI/segments;
    
    GLfloat *vertices = (GLfloat*)calloc( sizeof(GLfloat)*2*(segments+2), 1);
    if( ! vertices )
        return;
    
    for(unsigned int i = 0;i <= segments; i++) {
        float rads = i*coef;
        GLfloat j = radius * cosf(rads + angle) * scaleX + center.x;
        GLfloat k = radius * sinf(rads + angle) * scaleY + center.y;
        
        vertices[i*2] = j;
        vertices[i*2+1] = k;
    }
    vertices[(segments+1)*2] = center.x;
    vertices[(segments+1)*2+1] = center.y;
    
    s_shader->use();
    s_shader->setUniformsForBuiltins();
    s_shader->setUniformLocationWith4fv(s_colorLocation, (GLfloat*) &s_color.r, 1);
    
    GL::enableVertexAttribs( GL::VERTEX_ATTRIB_FLAG_POSITION );
    
#ifdef EMSCRIPTEN
    setGLBufferData(vertices, sizeof(GLfloat)*2*(segments+2));
    glVertexAttribPointer(GLProgram::VERTEX_ATTRIB_POSITION, 2, GL_FLOAT, GL_FALSE, 0, 0);
#else
    glVertexAttribPointer(GLProgram::VERTEX_ATTRIB_POSITION, 2, GL_FLOAT, GL_FALSE, 0, vertices);
#endif // EMSCRIPTEN
    
    glDrawArrays(GL_TRIANGLE_FAN, 0, (GLsizei) segments+1);
    
    ::free( vertices );
    
    CC_INCREMENT_GL_DRAWS(1);
}

void drawSolidCircle( const Point& center, float radius, float angle, unsigned int segments)
{
    drawSolidCircle(center, radius, angle, segments, 1.0f, 1.0f);
}

void drawQuadBezier(const Point& origin, const Point& control, const Point& destination, unsigned int segments)
{
    lazy_init();

    Vertex2F* vertices = new Vertex2F[segments + 1];

    float t = 0.0f;
    for(unsigned int i = 0; i < segments; i++)
    {
        vertices[i].x = powf(1 - t, 2) * origin.x + 2.0f * (1 - t) * t * control.x + t * t * destination.x;
        vertices[i].y = powf(1 - t, 2) * origin.y + 2.0f * (1 - t) * t * control.y + t * t * destination.y;
        t += 1.0f / segments;
    }
    vertices[segments].x = destination.x;
    vertices[segments].y = destination.y;

    s_shader->use();
    s_shader->setUniformsForBuiltins();
    s_shader->setUniformLocationWith4fv(s_colorLocation, (GLfloat*) &s_color.r, 1);

    GL::enableVertexAttribs( GL::VERTEX_ATTRIB_FLAG_POSITION );

#ifdef EMSCRIPTEN
    setGLBufferData(vertices, (segments + 1) * sizeof(Vertex2F));
    glVertexAttribPointer(GLProgram::VERTEX_ATTRIB_POSITION, 2, GL_FLOAT, GL_FALSE, 0, 0);
#else
    glVertexAttribPointer(GLProgram::VERTEX_ATTRIB_POSITION, 2, GL_FLOAT, GL_FALSE, 0, vertices);
#endif // EMSCRIPTEN
    glDrawArrays(GL_LINE_STRIP, 0, (GLsizei) segments + 1);
    CC_SAFE_DELETE_ARRAY(vertices);

    CC_INCREMENT_GL_DRAWS(1);
}

void drawCatmullRom( PointArray *points, unsigned int segments )
{
    drawCardinalSpline( points, 0.5f, segments );
}

void drawCardinalSpline( PointArray *config, float tension,  unsigned int segments )
{
    lazy_init();

    Vertex2F* vertices = new Vertex2F[segments + 1];

    unsigned int p;
    float lt;
    float deltaT = 1.0f / config->count();

    for( unsigned int i=0; i < segments+1;i++) {

        float dt = (float)i / segments;

        // border
        if( dt == 1 ) {
            p = config->count() - 1;
            lt = 1;
        } else {
            p = dt / deltaT;
            lt = (dt - deltaT * (float)p) / deltaT;
        }

        // Interpolate
        Point pp0 = config->getControlPointAtIndex(p-1);
        Point pp1 = config->getControlPointAtIndex(p+0);
        Point pp2 = config->getControlPointAtIndex(p+1);
        Point pp3 = config->getControlPointAtIndex(p+2);

        Point newPos = ccCardinalSplineAt( pp0, pp1, pp2, pp3, tension, lt);
        vertices[i].x = newPos.x;
        vertices[i].y = newPos.y;
    }

    s_shader->use();
    s_shader->setUniformsForBuiltins();
    s_shader->setUniformLocationWith4fv(s_colorLocation, (GLfloat*)&s_color.r, 1);

    GL::enableVertexAttribs( GL::VERTEX_ATTRIB_FLAG_POSITION );

#ifdef EMSCRIPTEN
    setGLBufferData(vertices, (segments + 1) * sizeof(Vertex2F));
    glVertexAttribPointer(GLProgram::VERTEX_ATTRIB_POSITION, 2, GL_FLOAT, GL_FALSE, 0, 0);
#else
    glVertexAttribPointer(GLProgram::VERTEX_ATTRIB_POSITION, 2, GL_FLOAT, GL_FALSE, 0, vertices);
#endif // EMSCRIPTEN
    glDrawArrays(GL_LINE_STRIP, 0, (GLsizei) segments + 1);

    CC_SAFE_DELETE_ARRAY(vertices);
    CC_INCREMENT_GL_DRAWS(1);
}

void drawCubicBezier(const Point& origin, const Point& control1, const Point& control2, const Point& destination, unsigned int segments)
{
    lazy_init();

    Vertex2F* vertices = new Vertex2F[segments + 1];

    float t = 0;
    for(unsigned int i = 0; i < segments; i++)
    {
        vertices[i].x = powf(1 - t, 3) * origin.x + 3.0f * powf(1 - t, 2) * t * control1.x + 3.0f * (1 - t) * t * t * control2.x + t * t * t * destination.x;
        vertices[i].y = powf(1 - t, 3) * origin.y + 3.0f * powf(1 - t, 2) * t * control1.y + 3.0f * (1 - t) * t * t * control2.y + t * t * t * destination.y;
        t += 1.0f / segments;
    }
    vertices[segments].x = destination.x;
    vertices[segments].y = destination.y;

    s_shader->use();
    s_shader->setUniformsForBuiltins();
    s_shader->setUniformLocationWith4fv(s_colorLocation, (GLfloat*) &s_color.r, 1);

    GL::enableVertexAttribs( GL::VERTEX_ATTRIB_FLAG_POSITION );

#ifdef EMSCRIPTEN
    setGLBufferData(vertices, (segments + 1) * sizeof(Vertex2F));
    glVertexAttribPointer(GLProgram::VERTEX_ATTRIB_POSITION, 2, GL_FLOAT, GL_FALSE, 0, 0);
#else
    glVertexAttribPointer(GLProgram::VERTEX_ATTRIB_POSITION, 2, GL_FLOAT, GL_FALSE, 0, vertices);
#endif // EMSCRIPTEN
    glDrawArrays(GL_LINE_STRIP, 0, (GLsizei) segments + 1);
    CC_SAFE_DELETE_ARRAY(vertices);

    CC_INCREMENT_GL_DRAWS(1);
}

void setDrawColor4F( GLfloat r, GLfloat g, GLfloat b, GLfloat a )
{
    s_color.r = r;
    s_color.g = g;
    s_color.b = b;
    s_color.a = a;
}

void setPointSize( GLfloat pointSize )
{
    s_pointSize = pointSize * CC_CONTENT_SCALE_FACTOR();

    //TODO :glPointSize( pointSize );

}

void setDrawColor4B( GLubyte r, GLubyte g, GLubyte b, GLubyte a )
{
    s_color.r = r/255.0f;
    s_color.g = g/255.0f;
    s_color.b = b/255.0f;
    s_color.a = a/255.0f;
}

} // DrawPrimitives namespace

NS_CC_END