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857 lines (730 loc) · 28 KB
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//-----------------------------------------------------------------------------
// OpenGL 1 based rendering interface.
//
// Copyright 2016 whitequark
//-----------------------------------------------------------------------------
#include "solvespace.h"
#ifdef WIN32
// Include after solvespace.h to avoid identifier clashes.
# include <windows.h> // required by GL headers
#endif
#ifdef __APPLE__
# include <OpenGL/gl.h>
# include <OpenGL/glu.h>
#else
# include <GL/gl.h>
# include <GL/glu.h>
#endif
namespace SolveSpace {
//-----------------------------------------------------------------------------
// Checks for buggy OpenGL renderers
//-----------------------------------------------------------------------------
// Intel GPUs with Mesa on *nix render thin lines poorly.
static bool HasIntelThinLineQuirk()
{
static bool quirkChecked, quirkEnabled;
if(!quirkChecked) {
const char *ident = (const char*)glGetString(GL_VENDOR);
if(ident != NULL) {
quirkChecked = true;
quirkEnabled = !strcmp(ident, "Intel Open Source Technology Center");
}
}
return quirkEnabled;
}
// The default Windows GL renderer really does implement GL 1.1,
// and cannot handle non-power-of-2 textures, which is legal.
static bool HasGl1V1Quirk()
{
static bool quirkChecked, quirkEnabled;
if(!quirkChecked) {
const char *ident = (const char*)glGetString(GL_VERSION);
if(ident != NULL) {
quirkChecked = true;
quirkEnabled = !strcmp(ident, "1.1.0");
}
}
return quirkEnabled;
}
//-----------------------------------------------------------------------------
// Thin wrappers around OpenGL functions to fix bugs, adapt them to our
// data structures, etc.
//-----------------------------------------------------------------------------
static inline void ssglNormal3v(Vector n) {
glNormal3d(n.x, n.y, n.z);
}
static inline void ssglVertex3v(Vector v) {
glVertex3d(v.x, v.y, v.z);
}
void ssglLineWidth(double width) {
if(HasIntelThinLineQuirk() && width < 1.6)
width = 1.6;
glLineWidth((GLfloat)width);
}
static inline void ssglColorRGBA(RgbaColor color) {
glColor4d(color.redF(), color.greenF(), color.blueF(), color.alphaF());
}
static inline void ssglMaterialRGBA(GLenum side, RgbaColor color) {
GLfloat mpb[] = { color.redF(), color.greenF(), color.blueF(), color.alphaF() };
glMaterialfv(side, GL_AMBIENT_AND_DIFFUSE, mpb);
}
static void ssglDepthRange(Canvas::Layer layer, int zIndex) {
switch(layer) {
case Canvas::Layer::NORMAL:
case Canvas::Layer::FRONT:
case Canvas::Layer::BACK:
glDepthFunc(GL_LEQUAL);
glDepthMask(GL_TRUE);
glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
break;
case Canvas::Layer::DEPTH_ONLY:
glDepthFunc(GL_LEQUAL);
glDepthMask(GL_TRUE);
glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);
break;
case Canvas::Layer::OCCLUDED:
glDepthFunc(GL_GREATER);
glDepthMask(GL_FALSE);
glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
break;
}
switch(layer) {
case Canvas::Layer::FRONT:
glDepthRange(0.0, 0.0);
break;
case Canvas::Layer::BACK:
glDepthRange(1.0, 1.0);
break;
case Canvas::Layer::NORMAL:
case Canvas::Layer::DEPTH_ONLY:
case Canvas::Layer::OCCLUDED:
// The size of this step depends on the resolution of the Z buffer; for
// a 16-bit buffer, this should be fine.
double offset = 1.0 / (65535 * 0.8) * zIndex;
glDepthRange(0.1 - offset, 1.0 - offset);
break;
}
}
static void ssglFillPattern(Canvas::FillPattern pattern) {
static bool Init;
static GLubyte MaskA[(32*32)/8];
static GLubyte MaskB[(32*32)/8];
if(!Init) {
int x, y;
for(x = 0; x < 32; x++) {
for(y = 0; y < 32; y++) {
int i = y*4 + x/8, b = x % 8;
int ym = y % 4, xm = x % 4;
for(int k = 0; k < 2; k++) {
if(xm >= 1 && xm <= 2 && ym >= 1 && ym <= 2) {
(k == 0 ? MaskB : MaskA)[i] |= (0x80 >> b);
}
ym = (ym + 2) % 4; xm = (xm + 2) % 4;
}
}
}
Init = true;
}
switch(pattern) {
case Canvas::FillPattern::SOLID:
glDisable(GL_POLYGON_STIPPLE);
break;
case Canvas::FillPattern::CHECKERED_A:
glEnable(GL_POLYGON_STIPPLE);
glPolygonStipple(MaskA);
break;
case Canvas::FillPattern::CHECKERED_B:
glEnable(GL_POLYGON_STIPPLE);
glPolygonStipple(MaskB);
break;
}
}
//-----------------------------------------------------------------------------
// OpenGL 1 / compatibility profile based renderer
//-----------------------------------------------------------------------------
class OpenGl1Renderer final : public ViewportCanvas {
public:
Camera camera;
Lighting lighting;
// Cached OpenGL state.
struct {
bool drawing;
GLenum mode;
hStroke hcs;
Stroke *stroke;
hFill hcf;
Fill *fill;
std::weak_ptr<const Pixmap> texture;
} current;
// List-initialize current to work around MSVC bug 746973.
OpenGl1Renderer() : camera(), lighting(), current({}) {}
const Camera &GetCamera() const override { return camera; }
void DrawLine(const Vector &a, const Vector &b, hStroke hcs) override;
void DrawEdges(const SEdgeList &el, hStroke hcs) override;
bool DrawBeziers(const SBezierList &bl, hStroke hcs) override { return false; }
void DrawOutlines(const SOutlineList &ol, hStroke hcs, DrawOutlinesAs drawAs) override;
void DrawVectorText(const std::string &text, double height,
const Vector &o, const Vector &u, const Vector &v,
hStroke hcs) override;
void DrawQuad(const Vector &a, const Vector &b, const Vector &c, const Vector &d,
hFill hcf) override;
void DrawPoint(const Vector &o, hStroke hcs) override;
void DrawPolygon(const SPolygon &p, hFill hcf) override;
void DrawMesh(const SMesh &m, hFill hcfFront, hFill hcfBack) override;
void DrawFaces(const SMesh &m, const std::vector<uint32_t> &faces, hFill hcf) override;
void DrawPixmap(std::shared_ptr<const Pixmap> pm,
const Vector &o, const Vector &u, const Vector &v,
const Point2d &ta, const Point2d &tb, hFill hcf) override;
void InvalidatePixmap(std::shared_ptr<const Pixmap> pm) override;
void SelectPrimitive(unsigned mode);
void UnSelectPrimitive();
Stroke *SelectStroke(hStroke hcs);
Fill *SelectFill(hFill hcf);
void SelectTexture(std::shared_ptr<const Pixmap> pm);
void DoFatLineEndcap(const Vector &p, const Vector &u, const Vector &v);
void DoFatLine(const Vector &a, const Vector &b, double width);
void DoLine(const Vector &a, const Vector &b, hStroke hcs);
void DoPoint(Vector p, double radius);
void DoStippledLine(const Vector &a, const Vector &b, hStroke hcs, double phase = 0.0);
void UpdateProjection();
void SetCamera(const Camera &camera) override;
void SetLighting(const Lighting &lighting) override;
void StartFrame() override;
void FlushFrame() override;
void FinishFrame() override;
std::shared_ptr<Pixmap> ReadFrame() override;
void GetIdent(const char **vendor, const char **renderer, const char **version) override;
};
//-----------------------------------------------------------------------------
// A simple OpenGL state tracker to group consecutive draw calls.
//-----------------------------------------------------------------------------
void OpenGl1Renderer::SelectPrimitive(GLenum mode) {
if(current.drawing && current.mode == mode) {
return;
} else if(current.drawing) {
glEnd();
}
glBegin(mode);
current.drawing = true;
current.mode = mode;
}
void OpenGl1Renderer::UnSelectPrimitive() {
if(!current.drawing) return;
glEnd();
current.drawing = false;
}
Canvas::Stroke *OpenGl1Renderer::SelectStroke(hStroke hcs) {
if(current.hcs == hcs) return current.stroke;
Stroke *stroke = strokes.FindById(hcs);
UnSelectPrimitive();
ssglColorRGBA(stroke->color);
ssglDepthRange(stroke->layer, stroke->zIndex);
ssglLineWidth(stroke->WidthPx(camera));
// Fat lines and points are quads affected by glPolygonStipple, so make sure
// they are displayed correctly.
ssglFillPattern(FillPattern::SOLID);
glDisable(GL_TEXTURE_2D);
current.hcs = hcs;
current.stroke = stroke;
current.hcf = {};
current.fill = NULL;
current.texture.reset();
return stroke;
}
Canvas::Fill *OpenGl1Renderer::SelectFill(hFill hcf) {
if(current.hcf == hcf) return current.fill;
Fill *fill = fills.FindById(hcf);
UnSelectPrimitive();
ssglColorRGBA(fill->color);
ssglDepthRange(fill->layer, fill->zIndex);
ssglFillPattern(fill->pattern);
glDisable(GL_TEXTURE_2D);
current.hcs = {};
current.stroke = NULL;
current.hcf = hcf;
current.fill = fill;
current.texture.reset();
return fill;
}
static int RoundUpToPowerOfTwo(int v)
{
for(int i = 0; i < 31; i++) {
int vt = (1 << i);
if(vt >= v) {
return vt;
}
}
return 0;
}
void OpenGl1Renderer::SelectTexture(std::shared_ptr<const Pixmap> pm) {
if(current.texture.lock() == pm) return;
glBindTexture(GL_TEXTURE_2D, 1);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
GLenum format = 0;
switch(pm->format) {
case Pixmap::Format::RGBA: format = GL_RGBA; break;
case Pixmap::Format::RGB: format = GL_RGB; break;
case Pixmap::Format::A: format = GL_ALPHA; break;
case Pixmap::Format::BGRA:
case Pixmap::Format::BGR:
ssassert(false, "Unexpected pixmap format");
}
if(!HasGl1V1Quirk()) {
glTexImage2D(GL_TEXTURE_2D, 0, format, pm->width, pm->height, 0,
format, GL_UNSIGNED_BYTE, &pm->data[0]);
} else {
GLsizei width = RoundUpToPowerOfTwo(pm->width);
GLsizei height = RoundUpToPowerOfTwo(pm->height);
glTexImage2D(GL_TEXTURE_2D, 0, format, width, height, 0,
format, GL_UNSIGNED_BYTE, 0);
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, pm->width, pm->height,
format, GL_UNSIGNED_BYTE, &pm->data[0]);
}
glEnable(GL_TEXTURE_2D);
current.texture = pm;
}
//-----------------------------------------------------------------------------
// OpenGL's GL_LINES mode does not work on lines thicker than about 3 px,
// so we have to draw thicker lines using triangles.
//-----------------------------------------------------------------------------
void OpenGl1Renderer::DoFatLineEndcap(const Vector &p, const Vector &u, const Vector &v) {
// A table of cos and sin of (pi*i/10 + pi/2), as i goes from 0 to 10
static const double Circle[11][2] = {
{ 0.0000, 1.0000 },
{ -0.3090, 0.9511 },
{ -0.5878, 0.8090 },
{ -0.8090, 0.5878 },
{ -0.9511, 0.3090 },
{ -1.0000, 0.0000 },
{ -0.9511, -0.3090 },
{ -0.8090, -0.5878 },
{ -0.5878, -0.8090 },
{ -0.3090, -0.9511 },
{ 0.0000, -1.0000 },
};
SelectPrimitive(GL_TRIANGLE_FAN);
for(auto pc : Circle) {
double c = pc[0], s = pc[1];
ssglVertex3v(p.Plus(u.ScaledBy(c)).Plus(v.ScaledBy(s)));
}
UnSelectPrimitive();
}
void OpenGl1Renderer::DoFatLine(const Vector &a, const Vector &b, double width) {
// The half-width of the line we're drawing.
double hw = width / 2;
Vector ab = b.Minus(a);
Vector gn = (camera.projRight).Cross(camera.projUp);
Vector abn = (ab.Cross(gn)).WithMagnitude(1);
abn = abn.Minus(gn.ScaledBy(gn.Dot(abn)));
// So now abn is normal to the projection of ab into the screen, so the
// line will always have constant thickness as the view is rotated.
abn = abn.WithMagnitude(hw);
ab = gn.Cross(abn);
ab = ab. WithMagnitude(hw);
// The body of a line is a quad
SelectPrimitive(GL_QUADS);
ssglVertex3v(a.Plus (abn));
ssglVertex3v(b.Plus (abn));
ssglVertex3v(b.Minus(abn));
ssglVertex3v(a.Minus(abn));
// And the line has two semi-circular end caps.
DoFatLineEndcap(a, ab, abn);
DoFatLineEndcap(b, ab.ScaledBy(-1), abn);
}
void OpenGl1Renderer::DoLine(const Vector &a, const Vector &b, hStroke hcs) {
if(a.Equals(b)) return;
Stroke *stroke = SelectStroke(hcs);
if(stroke->WidthPx(camera) <= 3.0) {
SelectPrimitive(GL_LINES);
ssglVertex3v(a);
ssglVertex3v(b);
} else {
DoFatLine(a, b, stroke->WidthPx(camera) / camera.scale);
}
}
void OpenGl1Renderer::DoPoint(Vector p, double d) {
if(d <= 3.0) {
Vector u = camera.projRight.WithMagnitude(d / 2.0 / camera.scale);
SelectPrimitive(GL_LINES);
ssglVertex3v(p.Minus(u));
ssglVertex3v(p.Plus(u));
} else {
Vector u = camera.projRight.WithMagnitude(d / 2.0 / camera.scale);
Vector v = camera.projUp.WithMagnitude(d / 2.0 / camera.scale);
DoFatLineEndcap(p, u, v);
DoFatLineEndcap(p, u.ScaledBy(-1.0), v);
}
}
void OpenGl1Renderer::DoStippledLine(const Vector &a, const Vector &b, hStroke hcs, double phase) {
Stroke *stroke = SelectStroke(hcs);
if(stroke->stipplePattern == StipplePattern::CONTINUOUS) {
DoLine(a, b, hcs);
return;
}
double scale = stroke->StippleScaleMm(camera);
const std::vector<double> &dashes = StipplePatternDashes(stroke->stipplePattern);
double length = StipplePatternLength(stroke->stipplePattern) * scale;
phase -= floor(phase / length) * length;
double curPhase = 0.0;
size_t curDash;
for(curDash = 0; curDash < dashes.size(); curDash++) {
curPhase += dashes[curDash] * scale;
if(phase < curPhase) break;
}
Vector dir = b.Minus(a);
double len = dir.Magnitude();
dir = dir.WithMagnitude(1.0);
double cur = 0.0;
Vector curPos = a;
double width = stroke->WidthMm(camera);
double curDashLen = (curPhase - phase) / scale;
while(cur < len) {
double next = std::min(len, cur + curDashLen * scale);
Vector nextPos = curPos.Plus(dir.ScaledBy(next - cur));
if(curDash % 2 == 0) {
if(curDashLen <= LENGTH_EPS) {
DoPoint(curPos, width);
} else {
DoLine(curPos, nextPos, hcs);
}
}
cur = next;
curPos = nextPos;
curDash++;
curDashLen = dashes[curDash % dashes.size()];
}
}
//-----------------------------------------------------------------------------
// A canvas implemented using OpenGL 3 immediate mode.
//-----------------------------------------------------------------------------
void OpenGl1Renderer::DrawLine(const Vector &a, const Vector &b, hStroke hcs) {
DoStippledLine(a, b, hcs);
}
void OpenGl1Renderer::DrawEdges(const SEdgeList &el, hStroke hcs) {
double phase = 0.0;
for(const SEdge *e = el.l.First(); e; e = el.l.NextAfter(e)) {
DoStippledLine(e->a, e->b, hcs, phase);
phase += e->a.Minus(e->b).Magnitude();
}
}
void OpenGl1Renderer::DrawOutlines(const SOutlineList &ol, hStroke hcs, DrawOutlinesAs drawAs) {
Vector projDir = camera.projRight.Cross(camera.projUp);
double phase = 0.0;
switch(drawAs) {
case DrawOutlinesAs::EMPHASIZED_AND_CONTOUR:
for(const SOutline &o : ol.l) {
if(o.IsVisible(projDir) || o.tag != 0) {
DoStippledLine(o.a, o.b, hcs, phase);
}
phase += o.a.Minus(o.b).Magnitude();
}
break;
case DrawOutlinesAs::EMPHASIZED_WITHOUT_CONTOUR:
for(const SOutline &o : ol.l) {
if(!o.IsVisible(projDir) && o.tag != 0) {
DoStippledLine(o.a, o.b, hcs, phase);
}
phase += o.a.Minus(o.b).Magnitude();
}
break;
case DrawOutlinesAs::CONTOUR_ONLY:
for(const SOutline &o : ol.l) {
if(o.IsVisible(projDir)) {
DoStippledLine(o.a, o.b, hcs, phase);
}
phase += o.a.Minus(o.b).Magnitude();
}
break;
}
}
void OpenGl1Renderer::DrawVectorText(const std::string &text, double height,
const Vector &o, const Vector &u, const Vector &v,
hStroke hcs) {
auto traceEdge = [&](Vector a, Vector b) { DoStippledLine(a, b, hcs); };
VectorFont::Builtin()->Trace(height, o, u, v, text, traceEdge, camera);
}
void OpenGl1Renderer::DrawQuad(const Vector &a, const Vector &b, const Vector &c, const Vector &d,
hFill hcf) {
SelectFill(hcf);
SelectPrimitive(GL_QUADS);
ssglVertex3v(a);
ssglVertex3v(b);
ssglVertex3v(c);
ssglVertex3v(d);
}
void OpenGl1Renderer::DrawPoint(const Vector &o, Canvas::hStroke hcs) {
Stroke *stroke = SelectStroke(hcs);
Canvas::Fill fill = {};
fill.layer = stroke->layer;
fill.zIndex = stroke->zIndex;
fill.color = stroke->color;
hFill hcf = GetFill(fill);
Vector r = camera.projRight.ScaledBy(stroke->width/2.0/camera.scale);
Vector u = camera.projUp.ScaledBy(stroke->width/2.0/camera.scale);
Vector a = o.Plus (r).Plus (u),
b = o.Plus (r).Minus(u),
c = o.Minus(r).Minus(u),
d = o.Minus(r).Plus (u);
DrawQuad(a, b, c, d, hcf);
}
#ifdef WIN32
#define SSGL_CALLBACK CALLBACK
#else
#define SSGL_CALLBACK
#endif
typedef void(SSGL_CALLBACK *GLUCallback)();
using CombineVec = std::vector<std::unique_ptr<Vector>>;
static void SSGL_CALLBACK Vertex(Vector *p) {
ssglVertex3v(*p);
}
static void SSGL_CALLBACK Combine(double coords[3], void *vertexData[4],
float weight[4], void **outData, void *inData) {
Vector *n = new Vector;
n->x = coords[0];
n->y = coords[1];
n->z = coords[2];
*outData = n;
CombineVec *vec = static_cast<CombineVec *>(inData);
vec->emplace_back(n);
}
void OpenGl1Renderer::DrawPolygon(const SPolygon &p, hFill hcf) {
UnSelectPrimitive();
SelectFill(hcf);
GLUtesselator *gt = gluNewTess();
gluTessCallback(gt, GLU_TESS_BEGIN, (GLUCallback) glBegin);
gluTessCallback(gt, GLU_TESS_VERTEX, (GLUCallback) Vertex);
gluTessCallback(gt, GLU_TESS_END, (GLUCallback) glEnd);
gluTessCallback(gt, GLU_TESS_COMBINE_DATA, (GLUCallback) Combine);
gluTessProperty(gt, GLU_TESS_WINDING_RULE, GLU_TESS_WINDING_ODD);
ssglNormal3v(p.normal);
gluTessNormal(gt, p.normal.x, p.normal.y, p.normal.z);
CombineVec vecs;
gluTessBeginPolygon(gt, &vecs);
for(const SContour &sc : p.l) {
gluTessBeginContour(gt);
for(const SPoint &sp : sc.l) {
double ap[3] = { sp.p.x, sp.p.y, sp.p.z };
gluTessVertex(gt, ap, (GLvoid *) &sp.p);
}
gluTessEndContour(gt);
}
gluTessEndPolygon(gt);
gluDeleteTess(gt);
}
void OpenGl1Renderer::DrawMesh(const SMesh &m, hFill hcfFront, hFill hcfBack) {
UnSelectPrimitive();
RgbaColor frontColor = {},
backColor = {};
Fill *frontFill = SelectFill(hcfFront);
frontColor = frontFill->color;
ssglMaterialRGBA(GL_FRONT, frontFill->color);
if(hcfBack.v != 0) {
Fill *backFill = fills.FindById(hcfBack);
backColor = backFill->color;
ssassert(frontFill->layer == backFill->layer &&
frontFill->zIndex == backFill->zIndex,
"frontFill and backFill should belong to the same depth range");
ssassert(frontFill->pattern == backFill->pattern,
"frontFill and backFill should have the same pattern");
glLightModeli(GL_LIGHT_MODEL_TWO_SIDE, 1);
ssglMaterialRGBA(GL_BACK, backFill->color);
} else {
glLightModeli(GL_LIGHT_MODEL_TWO_SIDE, 0);
}
RgbaColor triangleColor = {};
glEnable(GL_LIGHTING);
glBegin(GL_TRIANGLES);
for(const STriangle &tr : m.l) {
if(frontColor.IsEmpty() || backColor.IsEmpty()) {
if(triangleColor.IsEmpty() || !triangleColor.Equals(tr.meta.color)) {
triangleColor = tr.meta.color;
if(frontColor.IsEmpty()) {
ssglMaterialRGBA(GL_FRONT, triangleColor);
}
if(backColor.IsEmpty()) {
ssglMaterialRGBA(GL_BACK, triangleColor);
}
}
}
if(tr.an.EqualsExactly(Vector::From(0, 0, 0))) {
// Compute the normal from the vertices
ssglNormal3v(tr.Normal());
ssglVertex3v(tr.a);
ssglVertex3v(tr.b);
ssglVertex3v(tr.c);
} else {
// Use the exact normals that are specified
ssglNormal3v(tr.an);
ssglVertex3v(tr.a);
ssglNormal3v(tr.bn);
ssglVertex3v(tr.b);
ssglNormal3v(tr.cn);
ssglVertex3v(tr.c);
}
}
glEnd();
glDisable(GL_LIGHTING);
}
void OpenGl1Renderer::DrawFaces(const SMesh &m, const std::vector<uint32_t> &faces, hFill hcf) {
SelectFill(hcf);
SelectPrimitive(GL_TRIANGLES);
size_t facesSize = faces.size();
for(const STriangle &tr : m.l) {
uint32_t face = tr.meta.face;
for(size_t j = 0; j < facesSize; j++) {
if(faces[j] != face) continue;
ssglVertex3v(tr.a);
ssglVertex3v(tr.b);
ssglVertex3v(tr.c);
break;
}
}
}
void OpenGl1Renderer::DrawPixmap(std::shared_ptr<const Pixmap> pm,
const Vector &o, const Vector &u, const Vector &v,
const Point2d &ta, const Point2d &tb, hFill hcf) {
double xfactor = 1.0,
yfactor = 1.0;
if(HasGl1V1Quirk()) {
xfactor = (double)pm->width / RoundUpToPowerOfTwo(pm->width);
yfactor = (double)pm->height / RoundUpToPowerOfTwo(pm->height);
}
UnSelectPrimitive();
SelectFill(hcf);
SelectTexture(pm);
SelectPrimitive(GL_QUADS);
glTexCoord2d(ta.x * xfactor, ta.y * yfactor);
ssglVertex3v(o);
glTexCoord2d(ta.x * xfactor, tb.y * yfactor);
ssglVertex3v(o.Plus(v));
glTexCoord2d(tb.x * xfactor, tb.y * yfactor);
ssglVertex3v(o.Plus(u).Plus(v));
glTexCoord2d(tb.x * xfactor, ta.y * yfactor);
ssglVertex3v(o.Plus(u));
}
void OpenGl1Renderer::InvalidatePixmap(std::shared_ptr<const Pixmap> pm) {
if(current.texture.lock() == pm) {
current.texture.reset();
}
}
void OpenGl1Renderer::UpdateProjection() {
UnSelectPrimitive();
glViewport(0, 0,
(GLsizei)(camera.width * camera.pixelRatio),
(GLsizei)(camera.height * camera.pixelRatio));
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glScaled(camera.scale * 2.0 / camera.width,
camera.scale * 2.0 / camera.height,
camera.scale * 1.0 / 30000);
double mat[16];
// Last thing before display is to apply the perspective
double clp = camera.tangent * camera.scale;
MakeMatrix(mat, 1, 0, 0, 0,
0, 1, 0, 0,
0, 0, 1, 0,
0, 0, clp, 1);
glMultMatrixd(mat);
// Before that, we apply the rotation
Vector projRight = camera.projRight,
projUp = camera.projUp,
n = camera.projUp.Cross(camera.projRight);
MakeMatrix(mat, projRight.x, projRight.y, projRight.z, 0,
projUp.x, projUp.y, projUp.z, 0,
n.x, n.y, n.z, 0,
0, 0, 0, 1);
glMultMatrixd(mat);
// And before that, the translation
Vector offset = camera.offset;
MakeMatrix(mat, 1, 0, 0, offset.x,
0, 1, 0, offset.y,
0, 0, 1, offset.z,
0, 0, 0, 1);
glMultMatrixd(mat);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glClearDepth(1.0);
glClear(GL_DEPTH_BUFFER_BIT);
}
void OpenGl1Renderer::StartFrame() {
glEnable(GL_NORMALIZE);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glEnable(GL_BLEND);
glEnable(GL_LINE_SMOOTH);
glHint(GL_LINE_SMOOTH_HINT, GL_NICEST);
// don't enable GL_POLYGON_SMOOTH; that looks ugly on some graphics cards,
// drawn with leaks in the mesh
glDepthFunc(GL_LEQUAL);
glEnable(GL_DEPTH_TEST);
if(EXACT(lighting.lightIntensity[0] != 0.0)) {
glEnable(GL_LIGHT0);
GLfloat f = (GLfloat)lighting.lightIntensity[0];
GLfloat li0[] = { f, f, f, 1.0f };
glLightfv(GL_LIGHT0, GL_DIFFUSE, li0);
glLightfv(GL_LIGHT0, GL_SPECULAR, li0);
Vector ld = camera.VectorFromProjs(lighting.lightDirection[0]);
GLfloat ld0[4] = { (GLfloat)ld.x, (GLfloat)ld.y, (GLfloat)ld.z, 0 };
glLightfv(GL_LIGHT0, GL_POSITION, ld0);
}
if(EXACT(lighting.lightIntensity[1] != 0.0)) {
glEnable(GL_LIGHT1);
GLfloat f = (GLfloat)lighting.lightIntensity[1];
GLfloat li0[] = { f, f, f, 1.0f };
glLightfv(GL_LIGHT1, GL_DIFFUSE, li0);
glLightfv(GL_LIGHT1, GL_SPECULAR, li0);
Vector ld = camera.VectorFromProjs(lighting.lightDirection[1]);
GLfloat ld0[4] = { (GLfloat)ld.x, (GLfloat)ld.y, (GLfloat)ld.z, 0 };
glLightfv(GL_LIGHT1, GL_POSITION, ld0);
}
if(EXACT(lighting.ambientIntensity != 0.0)) {
GLfloat ambient[4] = { (float)lighting.ambientIntensity,
(float)lighting.ambientIntensity,
(float)lighting.ambientIntensity, 1 };
glLightModelfv(GL_LIGHT_MODEL_AMBIENT, ambient);
}
glClearColor(lighting.backgroundColor.redF(), lighting.backgroundColor.greenF(),
lighting.backgroundColor.blueF(), lighting.backgroundColor.alphaF());
glClear(GL_COLOR_BUFFER_BIT);
glClearDepth(1.0);
glClear(GL_DEPTH_BUFFER_BIT);
}
void OpenGl1Renderer::FlushFrame() {
UnSelectPrimitive();
glFlush();
}
void OpenGl1Renderer::FinishFrame() {
glFinish();
GLenum error = glGetError();
if(error != GL_NO_ERROR) {
dbp("glGetError() == 0x%X %s", error, gluErrorString(error));
}
}
std::shared_ptr<Pixmap> OpenGl1Renderer::ReadFrame() {
int width = (int)(camera.width * camera.pixelRatio);
int height = (int)(camera.height * camera.pixelRatio);
std::shared_ptr<Pixmap> pixmap =
Pixmap::Create(Pixmap::Format::RGB, (size_t)width, (size_t)height);
glReadPixels(0, 0, width, height, GL_RGB, GL_UNSIGNED_BYTE, &pixmap->data[0]);
ssassert(glGetError() == GL_NO_ERROR, "Unexpected glReadPixels error");
return pixmap;
}
void OpenGl1Renderer::GetIdent(const char **vendor, const char **renderer, const char **version) {
*vendor = (const char *)glGetString(GL_VENDOR);
*renderer = (const char *)glGetString(GL_RENDERER);
*version = (const char *)glGetString(GL_VERSION);
}
void OpenGl1Renderer::SetCamera(const Camera &c) {
camera = c;
UpdateProjection();
}
void OpenGl1Renderer::SetLighting(const Lighting &l) {
lighting = l;
}
std::shared_ptr<ViewportCanvas> CreateRenderer() {
return std::shared_ptr<ViewportCanvas>(new OpenGl1Renderer());
}
}
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