static SDL_bool
GLES_SupportsBlendMode(SDL_Renderer * renderer, SDL_BlendMode blendMode)
{
GLES_RenderData *data = (GLES_RenderData *) renderer->driverdata;
SDL_BlendFactor srcColorFactor = SDL_GetBlendModeSrcColorFactor(blendMode);
SDL_BlendFactor srcAlphaFactor = SDL_GetBlendModeSrcAlphaFactor(blendMode);
SDL_BlendOperation colorOperation = SDL_GetBlendModeColorOperation(blendMode);
SDL_BlendFactor dstColorFactor = SDL_GetBlendModeDstColorFactor(blendMode);
SDL_BlendFactor dstAlphaFactor = SDL_GetBlendModeDstAlphaFactor(blendMode);
SDL_BlendOperation alphaOperation = SDL_GetBlendModeAlphaOperation(blendMode);
if (GetBlendFunc(srcColorFactor) == GL_INVALID_ENUM ||
GetBlendFunc(srcAlphaFactor) == GL_INVALID_ENUM ||
GetBlendEquation(colorOperation) == GL_INVALID_ENUM ||
GetBlendFunc(dstColorFactor) == GL_INVALID_ENUM ||
GetBlendFunc(dstAlphaFactor) == GL_INVALID_ENUM ||
GetBlendEquation(alphaOperation) == GL_INVALID_ENUM) {
return SDL_FALSE;
}
if ((srcColorFactor != srcAlphaFactor || dstColorFactor != dstAlphaFactor) && !data->GL_OES_blend_func_separate_supported) {
return SDL_FALSE;
}
if (colorOperation != alphaOperation && !data->GL_OES_blend_equation_separate_supported) {
return SDL_FALSE;
}
if (colorOperation != SDL_BLENDOPERATION_ADD && !data->GL_OES_blend_subtract_supported) {
return SDL_FALSE;
}
return SDL_TRUE;
}
static void
GLES_SetBlendMode(GLES_RenderData * data, SDL_BlendMode blendMode)
{
if (blendMode != data->current.blendMode) {
if (blendMode == SDL_BLENDMODE_NONE) {
data->glDisable(GL_BLEND);
} else {
data->glEnable(GL_BLEND);
if (data->GL_OES_blend_func_separate_supported) {
data->glBlendFuncSeparateOES(GetBlendFunc(SDL_GetBlendModeSrcColorFactor(blendMode)),
GetBlendFunc(SDL_GetBlendModeDstColorFactor(blendMode)),
GetBlendFunc(SDL_GetBlendModeSrcAlphaFactor(blendMode)),
GetBlendFunc(SDL_GetBlendModeDstAlphaFactor(blendMode)));
} else {
data->glBlendFunc(GetBlendFunc(SDL_GetBlendModeSrcColorFactor(blendMode)),
GetBlendFunc(SDL_GetBlendModeDstColorFactor(blendMode)));
}
if (data->GL_OES_blend_equation_separate_supported) {
data->glBlendEquationSeparateOES(GetBlendEquation(SDL_GetBlendModeColorOperation(blendMode)),
GetBlendEquation(SDL_GetBlendModeAlphaOperation(blendMode)));
} else if (data->GL_OES_blend_subtract_supported) {
data->glBlendEquationOES(GetBlendEquation(SDL_GetBlendModeColorOperation(blendMode)));
}
}
data->current.blendMode = blendMode;
}
}
void CG3DGraphicsGL::ApplySet(CG3DGlobalSet::SetType type)
{
switch (type) {
case CG3DGlobalSet::COLOUR: {
CG3DColourSet* set = (CG3DColourSet*)m_Stacks[type].m_Value;
if (set->m_DoClear)
m_ClearEnabled |= GL_COLOR_BUFFER_BIT;
else
m_ClearEnabled &= ~GL_COLOR_BUFFER_BIT;
CG3DVector4 cfloat = set->m_Clear.Get4f();
glClearColor(cfloat.x, cfloat.y, cfloat.z, cfloat.w);
glColorMask(set->m_UseR, set->m_UseG, set->m_UseB, set->m_UseA);
} break;
case CG3DGlobalSet::DEPTH: {
CG3DDepthSet* set = (CG3DDepthSet*)m_Stacks[type].m_Value;
if (set->m_DoClear)
m_ClearEnabled |= GL_DEPTH_BUFFER_BIT;
else
m_ClearEnabled &= ~GL_DEPTH_BUFFER_BIT;
glClearDepthf(set->m_Clear);
glDepthMask(set->m_WriteDepth);
switch (set->m_Test) {
case CG3DDepthSet::ALWAYS: glDisable(GL_DEPTH_TEST); break;
case CG3DDepthSet::NEVER: glEnable(GL_DEPTH_TEST); glDepthFunc(GL_NEVER); break;
case CG3DDepthSet::LESS: glEnable(GL_DEPTH_TEST); glDepthFunc(GL_LESS); break;
case CG3DDepthSet::LEQUAL: glEnable(GL_DEPTH_TEST); glDepthFunc(GL_LEQUAL); break;
case CG3DDepthSet::EQUAL: glEnable(GL_DEPTH_TEST); glDepthFunc(GL_EQUAL); break;
case CG3DDepthSet::GREATER: glEnable(GL_DEPTH_TEST); glDepthFunc(GL_GREATER); break;
case CG3DDepthSet::GEQUAL: glEnable(GL_DEPTH_TEST); glDepthFunc(GL_GEQUAL); break;
case CG3DDepthSet::NOTEQUAL: glEnable(GL_DEPTH_TEST); glDepthFunc(GL_NOTEQUAL); break;
}
} break;
case CG3DGlobalSet::STENCIL: {
CG3DStencilSet* set = (CG3DStencilSet*)m_Stacks[type].m_Value;
if (set->m_DoClear)
m_ClearEnabled |= GL_STENCIL_BUFFER_BIT;
else
m_ClearEnabled &= ~GL_STENCIL_BUFFER_BIT;
glClearStencil(set->m_Clear);
ApplyStencil(set);
} break;
case CG3DGlobalSet::CULL: {
CG3DCullSet* set = (CG3DCullSet*)m_Stacks[type].m_Value;
switch (set->m_Cull) {
case CG3DCullSet::CULL_NONE: glDisable(GL_CULL_FACE); break;
case CG3DCullSet::CULL_FRONT: glEnable(GL_CULL_FACE); glCullFace(GL_FRONT); break;
case CG3DCullSet::CULL_BACK: glEnable(GL_CULL_FACE); glCullFace(GL_BACK); break;
}
//if (set->m_FrontIsCCW != CG3DCullSet::NO)
glFrontFace(GL_CCW);
//else
// glFrontFace(GL_CW);
} break;
case CG3DGlobalSet::VIEWPORT: {
CG3DViewportSet* set = (CG3DViewportSet*)m_Stacks[type].m_Value;
glViewport((int)set->m_Rect.x, (int)set->m_Rect.y, (int)set->m_Rect.z, (int)set->m_Rect.w);
glDepthRangef(set->m_NearZ, set->m_FarZ);
} break;
case CG3DGlobalSet::SCISSOR: {
CG3DScissorSet* set = (CG3DScissorSet*)m_Stacks[type].m_Value;
if (set->m_Do)
glEnable(GL_SCISSOR_TEST);
else
glDisable(GL_SCISSOR_TEST);
glScissor((int)set->m_Rect.x, (int)set->m_Rect.y, (int)set->m_Rect.z, (int)set->m_Rect.w);
} break;
case CG3DGlobalSet::BLEND: {
CG3DBlendSet* set = (CG3DBlendSet*)m_Stacks[type].m_Value;
CG3DVector4 col = set->m_Colour.Get4f();
switch (set->m_Mode)
{
case CG3DBlendSet::OFF:
glDisable(GL_BLEND);
break;
case CG3DBlendSet::COMBINED:
glEnable(GL_BLEND);
glBlendEquation(GetBlendFunc(set->m_Func));
glBlendFunc(GetBlendParam(set->m_Src), GetBlendParam(set->m_Dest));
glBlendColor(col.x, col.y, col.z, col.w);
break;
case CG3DBlendSet::SEPARATE:
glEnable(GL_BLEND);
glBlendEquationSeparate(GetBlendFunc(set->m_Func), GetBlendFunc(set->m_FuncAlpha));
glBlendFuncSeparate(GetBlendParam(set->m_Src), GetBlendParam(set->m_Dest), GetBlendParam(set->m_SrcAlpha), GetBlendParam(set->m_DestAlpha));
glBlendColor(col.x, col.y, col.z, col.w);
break;
}
} break;
case CG3DGlobalSet::SAMPLE_COVERAGE: {
CG3DSampleCoverageSet* set = (CG3DSampleCoverageSet*)m_Stacks[type].m_Value;
if (set->m_Coverage)
glEnable(GL_SAMPLE_COVERAGE);
else
glDisable(GL_SAMPLE_COVERAGE);
if (set->m_AlphaCoverage)
glEnable(GL_SAMPLE_ALPHA_TO_COVERAGE);
else
glDisable(GL_SAMPLE_ALPHA_TO_COVERAGE);
glSampleCoverage(set->m_Value, set->m_Invert);
} break;
case CG3DGlobalSet::DITHER: {
CG3DDitherSet* set = (CG3DDitherSet*)m_Stacks[type].m_Value;
if (set->m_Dither)
glEnable(GL_DITHER);
else
glDisable(GL_DITHER);
} break;
case CG3DGlobalSet::POLYGON_OFFSET: {
CG3DPolygonOffsetSet* set = (CG3DPolygonOffsetSet*)m_Stacks[type].m_Value;
if (set->m_PolygonOffset)
glEnable(GL_POLYGON_OFFSET_FILL);
else
glDisable(GL_POLYGON_OFFSET_FILL);
glPolygonOffset(set->m_Factor, set->m_Units);
} break;
}
}
bool LWFRendererFactory::Render(class LWF *lwf, Node *node,
BlendEquationProtocol *be, int renderingIndex, bool visible,
BlendFunc *baseBlendFunc)
{
m_renderingIndex = renderingIndex;
node->setVisible(visible);
if (!visible)
return false;
Node *target;
switch (m_maskMode) {
case Format::BLEND_MODE_ERASE:
case Format::BLEND_MODE_MASK:
case Format::BLEND_MODE_LAYER:
{
LWFMask *mask;
if (m_lastMaskMode != m_maskMode) {
++m_maskNo;
if (m_masks.size() > m_maskNo) {
mask = m_masks[m_maskNo];
} else {
mask = LWFMask::create();
m_masks.push_back(mask);
}
PlaceNode(m_node, mask);
LWFMask *layer = nullptr;
if (m_lastMaskMode == Format::BLEND_MODE_LAYER &&
(m_maskMode == Format::BLEND_MODE_ERASE ||
m_maskMode == Format::BLEND_MODE_MASK) &&
m_maskNo > 0) {
layer = m_masks[m_maskNo - 1];
if (layer)
layer->setLocalZOrder(INT_MAX);
PlaceNode(mask, layer);
}
if (layer && mask) {
switch (m_maskMode) {
case Format::BLEND_MODE_ERASE:
case Format::BLEND_MODE_MASK:
switch (m_maskMode) {
case Format::BLEND_MODE_ERASE:
layer->setBlendFunc(
{GL_ONE_MINUS_DST_ALPHA, GL_ZERO});
break;
case Format::BLEND_MODE_MASK:
layer->setBlendFunc(
{GL_DST_ALPHA, GL_ZERO});
break;
}
BlendFunc blendFunc = {GL_ONE, GL_ZERO};
GetBlendFunc(blendFunc, m_blendMode);
mask->setBlendFunc(blendFunc);
break;
}
}
m_lastMaskMode = m_maskMode;
} else {
mask = m_masks[m_maskNo];
}
if (mask)
mask->setLocalZOrder(m_renderingIndex + 1);
target = mask;
}
break;
default:
target = m_node;
break;
}
PlaceNode(target, node);
node->setLocalZOrder(renderingIndex);
BlendProtocol *p = dynamic_cast<BlendProtocol *>(node);
if (p) {
BlendFunc blendFunc =
baseBlendFunc ? *baseBlendFunc : p->getBlendFunc();
GetBlendFunc(blendFunc, m_blendMode);
p->setBlendFunc(blendFunc);
}
BlendEquationProtocol *ep = dynamic_cast<BlendEquationProtocol *>(node);
if (ep)
ep->setBlendEquation(m_blendMode);
return true;
}
void WalkEdges(const GEdge e1, const GEdge e2, const GPaint &paint) {
const GBitmap &bm = GetInternalBitmap();
int h = bm.fHeight;
int w = bm.fWidth;
GASSERT(e1.p1.y() == e2.p1.y());
int startY = Clamp(static_cast<int>(e1.p1.y() + 0.5f), 0, h-1);
GASSERT(e1.p2.y() == e2.p2.y());
int endY = Clamp(static_cast<int>(e1.p2.y() + 0.5f), 0, h-1);
if(endY == startY) {
return;
}
GASSERT(endY > startY);
// Initialize to NAN
float m1 = 0.0f/0.0f, b1;
float m2 = 0.0f/0.0f, b2;
bool vert1 = e1.ComputeLine(m1, b1);
bool vert2 = e2.ComputeLine(m2, b2);
if(m1 == 0 || m2 == 0) {
return;
}
// Collinear?
if(vert2 && vert1 && e1.p1.x() == e2.p1.x()) {
return;
} else if(m1 == m2 && b1 == b2) {
return;
}
float stepX1 = vert1? 0 : 1/m1;
float stepX2 = vert2? 0 : 1/m2;
GPoint p1, p2;
float sY = static_cast<float>(startY) + 0.5f;
if(vert1) {
p1.set(e1.p1.x(), sY);
} else {
p1.set((sY - b1) / m1, sY);
}
if(vert2) {
p2.set(e2.p1.x(), sY);
} else {
p2.set((sY - b2) / m2, sY);
}
// Make sure that p1 is always less than p2 to avoid
// doing a min/max in the inner loop
if(p1.x() > p2.x()) {
std::swap(p1, p2);
std::swap(stepX1, stepX2);
}
GPixel color = ColorToPixel(paint.getColor());
BlendFunc blend = GetBlendFunc(eBlendOp_SrcOver);
uint32_t nSteps = endY - startY;
for(uint32_t i = 0; i < nSteps; i++) {
// Since we haven't implemented clipping yet, take care
// not to go beyond our bounds...
const int x1 = Clamp<int>(p1.fX + 0.5f, 0, w-1);
const int x2 = Clamp<int>(p2.fX + 0.5f, 0, w-1);
GPixel *row = GetRow(bm, startY + i);
for(int x = x1; x < x2; x++) {
row[x] = blend(row[x], color);
}
p1.fX += stepX1;
p2.fX += stepX2;
}
}
void fillIRect(const GIRect &rect, const GColor &c, EBlendOp op) {
const GBitmap &bitmap = GetInternalBitmap();
uint32_t h = bitmap.fHeight;
uint32_t w = bitmap.fWidth;
GIRect bmRect;
if(!(bmRect.setIntersection(rect, GIRect::MakeWH(w, h))))
return;
h = bmRect.height();
w = bmRect.width();
// premultiply alpha ...
GPixel clearValue = ColorToPixel(c);
// Figure out blendfunc
BlendFunc blend = GetBlendFunc(op);
if(bitmap.fRowBytes == w * sizeof(GPixel)) {
GPixel *p = bitmap.fPixels + bmRect.fTop*bitmap.fWidth + bmRect.fLeft;
switch(op) {
case eBlendOp_Src:
memsetPixel(p, clearValue, w*h);
break;
default: {
GPixel *end = bitmap.fPixels + ((bmRect.fBottom - 1) * w + bmRect.fRight);
for(; p != end; p++) {
*p = blend(*p, clearValue);
}
break;
}
}
} else {
for(uint32_t j = bmRect.fTop; j < bmRect.fBottom; j++) {
GPixel *rowPixels = GetRow(bitmap, j) + bmRect.fLeft;
switch(op) {
case eBlendOp_Src: {
memsetPixel(rowPixels, clearValue, w);
break;
}
default: {
GPixel oldP = rowPixels[0];
GPixel newP = blend(oldP, clearValue);
rowPixels[0] = newP;
for(uint32_t i = 1; i < w; i++) {
if(oldP == rowPixels[i]) {
rowPixels[i] = newP;
} else {
oldP = rowPixels[i];
newP = rowPixels[i] = blend(rowPixels[i], clearValue);
}
}
break;
}
} // switch
} // for
} // else
}
