int main(void) {
ss varying(4) x;
ss varying(4) y;
//x.a = 42;
//x.b = 42;
//y = x;
return 0;
}
/* plot_line
*
* Plot a line defined by two points in window coordinates. Use Bresenham's
* Algorithm for this. Don't forget to interpolate the normals and texture
* coordinates as well.
*/
void canvashdl::plot_line(vec3f v1, vector<float> v1_varying, vec3f v2, vector<float> v2_varying)
{
vec3i s1 = (vec3i)v1;
vec3i s2 = (vec3i)v2;
int b = (abs(s2[1] - s1[1]) > abs(s2[0] - s1[0]));
vec2i dv = (vec2i)s2 - (vec2i)s1;
vec2i step((int)(dv[0] > 0) - (int)(dv[0] < 0),
(int)(dv[1] > 0) - (int)(dv[1] < 0));
dv[0] *= step[0];
dv[1] *= step[1];
int D = 2*dv[1-b] - dv[b];
vector<float> varying(v1_varying.size());
if (shade_model == flat)
for (int i = 0; i < (int)v1_varying.size(); i++)
varying[i] = (v1_varying[i] + v2_varying[i])/2.0f;
else
varying = v1_varying;
plot(s1, varying);
vec3i p = s1;
float increment = (float)step[b]/(float)(s2[b] - s1[b]);
float interpolate = 0.0f;
float zdiff = v2[2] - v1[2];
p[b]+=step[b];
while (step[b]*p[b] < step[b]*s2[b])
{
if (D > 0)
{
p[1-b] += step[1-b];
D += 2*(dv[1-b] - dv[b]);
}
else
D += 2*dv[1-b];
p[2] = (int)(zdiff*interpolate) + s1[2];
if (shade_model != flat)
for (int i = 0; i < (int)v1_varying.size(); i++)
varying[i] = (v2_varying[i] - v1_varying[i])*interpolate + v1_varying[i];
plot(p, varying);
p[b] += step[b];
interpolate += increment;
}
}
void Vc4Shader::Emit_Prologue_PS()
{
assert(this->uShaderType == D3D10_SB_PIXEL_SHADER);
for (uint8_t i = 0, iRegUsed = 0; iRegUsed < this->cInput; i++)
{
Vc4Register raX = this->InputRegister[i / 4][i % 4];
if (raX.GetFlags().valid)
{
assert(raX.GetMux() == VC4_QPU_ALU_REG_A || raX.GetMux() == VC4_QPU_ALU_REG_B);
Vc4Register r0(VC4_QPU_ALU_R0, VC4_QPU_WADDR_ACC0);
// Issue mul inputs (from varying) with ra15 (W).
{
Vc4Instruction Vc4Inst;
Vc4Register varying(VC4_QPU_ALU_REG_B, VC4_QPU_RADDR_VERYING);
Vc4Register ra15(VC4_QPU_ALU_REG_A, 15);
Vc4Inst.Vc4_m_FMUL(r0, varying, ra15);
Vc4Inst.Emit(CurrentStorage);
}
// Issue add r5 to each input data to complete interpolation.
{
Vc4Instruction Vc4Inst;
Vc4Register r5(VC4_QPU_ALU_R5);
Vc4Inst.Vc4_a_FADD(raX, r0, r5);
Vc4Inst.Emit(CurrentStorage);
}
iRegUsed++;
}
}
{ // Emit a NOP with 'sbwait'
Vc4Instruction Vc4Inst;
Vc4Inst.Vc4_Sig(VC4_QPU_SIG_WAIT_FOR_SCOREBOARD);
Vc4Inst.Emit(CurrentStorage);
}
}
void onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) override {
const DefaultGeoProc& gp = args.fGP.cast<DefaultGeoProc>();
GrGLSLVertexBuilder* vertBuilder = args.fVertBuilder;
GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
GrGLSLVaryingHandler* varyingHandler = args.fVaryingHandler;
GrGLSLUniformHandler* uniformHandler = args.fUniformHandler;
// emit attributes
varyingHandler->emitAttributes(gp);
// Setup pass through color
if (gp.hasVertexColor()) {
GrGLSLVarying varying(kHalf4_GrSLType);
varyingHandler->addVarying("color", &varying);
// There are several optional steps to process the color. Start with the attribute:
vertBuilder->codeAppendf("half4 color = %s;", gp.inColor()->fName);
// Linearize
if (gp.linearizeColor()) {
SkString srgbFuncName;
static const GrShaderVar gSrgbArgs[] = {
GrShaderVar("x", kHalf_GrSLType),
};
vertBuilder->emitFunction(kHalf_GrSLType,
"srgb_to_linear",
SK_ARRAY_COUNT(gSrgbArgs),
gSrgbArgs,
"return (x <= 0.04045) ? (x / 12.92) "
": pow((x + 0.055) / 1.055, 2.4);",
&srgbFuncName);
vertBuilder->codeAppendf("color = half4(%s(%s.r), %s(%s.g), %s(%s.b), %s.a);",
srgbFuncName.c_str(), gp.inColor()->fName,
srgbFuncName.c_str(), gp.inColor()->fName,
srgbFuncName.c_str(), gp.inColor()->fName,
gp.inColor()->fName);
}
// For SkColor, do a red/blue swap and premul
if (gp.fFlags & kColorAttributeIsSkColor_GPFlag) {
vertBuilder->codeAppend("color = half4(color.a * color.bgr, color.a);");
}
// Do color-correction to destination gamut
if (gp.linearizeColor()) {
fColorSpaceHelper.emitCode(uniformHandler, gp.fColorSpaceXform.get(),
kVertex_GrShaderFlag);
if (fColorSpaceHelper.isValid()) {
SkString xformedColor;
vertBuilder->appendColorGamutXform(&xformedColor, "color",
&fColorSpaceHelper);
vertBuilder->codeAppendf("color = %s;", xformedColor.c_str());
}
}
vertBuilder->codeAppendf("%s = color;\n", varying.vsOut());
fragBuilder->codeAppendf("%s = %s;", args.fOutputColor, varying.fsIn());
} else {
this->setupUniformColor(fragBuilder, uniformHandler, args.fOutputColor,
&fColorUniform);
}
// Setup position
this->writeOutputPosition(vertBuilder,
uniformHandler,
gpArgs,
gp.inPosition()->fName,
gp.viewMatrix(),
&fViewMatrixUniform);
if (gp.hasExplicitLocalCoords()) {
// emit transforms with explicit local coords
this->emitTransforms(vertBuilder,
varyingHandler,
uniformHandler,
gp.inLocalCoords()->asShaderVar(),
gp.localMatrix(),
args.fFPCoordTransformHandler);
} else {
// emit transforms with position
this->emitTransforms(vertBuilder,
varyingHandler,
uniformHandler,
gp.inPosition()->asShaderVar(),
gp.localMatrix(),
args.fFPCoordTransformHandler);
}
// Setup coverage as pass through
if (gp.hasVertexCoverage()) {
fragBuilder->codeAppendf("half alpha = 1.0;");
varyingHandler->addPassThroughAttribute(gp.inCoverage(), "alpha");
fragBuilder->codeAppendf("%s = half4(alpha);", args.fOutputCoverage);
} else if (gp.coverage() == 0xff) {
fragBuilder->codeAppendf("%s = half4(1);", args.fOutputCoverage);
} else {
const char* fragCoverage;
fCoverageUniform = uniformHandler->addUniform(kFragment_GrShaderFlag,
kHalf_GrSLType,
"Coverage",
&fragCoverage);
fragBuilder->codeAppendf("%s = half4(%s);", args.fOutputCoverage, fragCoverage);
}
}