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/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkGLState.h"
#include "SkColorPriv.h"
// here is our global instance
SkGLState SkGLState::gState;
// this is an illegal pmcolor, since its alpha (0) is less than its red
#define UNKNOWN_PMCOLOR (SK_R32_MASK << SK_R32_SHIFT)
#define UNKNOWN_GLENUM ((GLenum)-1)
// MUST be in the same order as SkGLState::Caps enum
static const GLenum gCapsTable[] = {
GL_DITHER,
GL_TEXTURE_2D,
};
// MUST be in the same order as SkGLState::ClientState enum
static const GLenum gClientStateTable[] = {
GL_TEXTURE_COORD_ARRAY,
GL_COLOR_ARRAY,
};
static const GLenum gShadeModelTable[] = {
GL_FLAT,
GL_SMOOTH
};
///////////////////////////////////////////////////////////////////////////////
SkGLState::SkGLState() :
fCapsPtr(gCapsTable),
fClientPtr(gClientStateTable),
fShadePtr(gShadeModelTable) {
this->init();
}
void SkGLState::init() {
fCapBits = 0;
fClientStateBits = 0;
fShadeModel = UNKNOWN_GLENUM;
fScissorSize.set(-1, -1);
fPMColor = UNKNOWN_PMCOLOR;
fSrcBlend = fDstBlend = UNKNOWN_GLENUM;
fPointSize = fLineWidth = -1;
}
void SkGLState::reset() {
this->init();
size_t i;
for (i = 0; i < SK_ARRAY_COUNT(gCapsTable); i++) {
glDisable(fCapsPtr[i]);
}
for (i = 0; i < SK_ARRAY_COUNT(gClientStateTable); i++) {
glDisableClientState(fClientPtr[i]);
}
}
///////////////////////////////////////////////////////////////////////////////
void SkGLState::enable(Caps c) {
unsigned mask = 1 << c;
if ((fCapBits & mask) == 0) {
fCapBits |= mask;
glEnable(fCapsPtr[c]);
}
}
void SkGLState::disable(Caps c) {
unsigned mask = 1 << c;
if (fCapBits & mask) {
fCapBits &= ~mask;
glDisable(fCapsPtr[c]);
}
}
void SkGLState::enableClientState(ClientState c) {
unsigned mask = 1 << c;
if ((fClientStateBits & mask) == 0) {
fClientStateBits |= mask;
glEnableClientState(fClientPtr[c]);
}
}
void SkGLState::disableClientState(ClientState c) {
unsigned mask = 1 << c;
if (fClientStateBits & mask) {
fClientStateBits &= ~mask;
glDisableClientState(fClientPtr[c]);
}
}
void SkGLState::shadeModel(ShadeModel s) {
if (fShadeModel != s) {
fShadeModel = s;
glShadeModel(fShadePtr[s]);
}
}
void SkGLState::scissor(int x, int y, int w, int h) {
SkASSERT(w >= 0 && h >= 0);
if (!fScissorLoc.equals(x, y) || !fScissorSize.equals(w, h)) {
fScissorLoc.set(x, y);
fScissorSize.set(w, h);
glScissor(x, y, w, h);
}
}
void SkGLState::pointSize(float x) {
if (fPointSize != x) {
fPointSize = x;
glPointSize(x);
}
}
void SkGLState::lineWidth(float x) {
if (fLineWidth != x) {
fLineWidth = x;
glLineWidth(x);
}
}
void SkGLState::blendFunc(GLenum src, GLenum dst) {
if (fSrcBlend != src || fDstBlend != dst) {
fSrcBlend = src;
fDstBlend = dst;
glBlendFunc(src, dst);
}
}
///////////////////////////////////////////////////////////////////////////////
#ifdef SK_GL_HAS_COLOR4UB
static inline void gl_pmcolor(U8CPU r, U8CPU g, U8CPU b, U8CPU a) {
glColor4ub(r, g, b, a);
}
#else
static inline SkFixed byte2fixed(U8CPU value) {
return ((value << 8) | value) + (value >> 7);
}
static inline void gl_pmcolor(U8CPU r, U8CPU g, U8CPU b, U8CPU a) {
glColor4x(byte2fixed(r), byte2fixed(g), byte2fixed(b), byte2fixed(a));
}
#endif
void SkGLState::pmColor(SkPMColor c) {
if (fPMColor != c) {
fPMColor = c;
gl_pmcolor(SkGetPackedR32(c), SkGetPackedG32(c),
SkGetPackedB32(c), SkGetPackedA32(c));
}
}
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