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Moved line and shape drawing code out of the opengl folder, since it no longer directly calls any OpenGL functions.

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--HG--
branch : minor
This commit is contained in:
Alex Szpakowski
2016-12-27 23:21:25 -04:00
parent 70df473680
commit 603c3e43d5
8 changed files with 353 additions and 366 deletions
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src/modules/graphics/Graphics.cpp
+259
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@@ -20,6 +20,7 @@
#include "Graphics.h"
#include "math/MathModule.h"
#include "Polyline.h"
namespace love
{
@@ -185,6 +186,264 @@ Graphics::StreamVertexData Graphics::requestStreamDraw(const StreamDrawRequest &
return d;
}
int Graphics::calculateEllipsePoints(float rx, float ry) const
{
int points = (int) sqrtf(((rx + ry) / 2.0f) * 20.0f * (float) pixelScaleStack.back());
return std::max(points, 8);
}
void Graphics::polyline(const float *coords, size_t count)
{
float halfwidth = getLineWidth() * 0.5f;
LineJoin linejoin = getLineJoin();
LineStyle linestyle = getLineStyle();
float pixelsize = 1.0f / std::max((float) pixelScaleStack.back(), 0.000001f);
if (linejoin == LINE_JOIN_NONE)
{
NoneJoinPolyline line;
line.render(coords, count, halfwidth, pixelsize, linestyle == LINE_SMOOTH);
line.draw(this);
}
else if (linejoin == LINE_JOIN_BEVEL)
{
BevelJoinPolyline line;
line.render(coords, count, halfwidth, pixelsize, linestyle == LINE_SMOOTH);
line.draw(this);
}
else if (linejoin == LINE_JOIN_MITER)
{
MiterJoinPolyline line;
line.render(coords, count, halfwidth, pixelsize, linestyle == LINE_SMOOTH);
line.draw(this);
}
}
void Graphics::rectangle(DrawMode mode, float x, float y, float w, float h)
{
float coords[] = {x,y, x,y+h, x+w,y+h, x+w,y, x,y};
polygon(mode, coords, 5 * 2);
}
void Graphics::rectangle(DrawMode mode, float x, float y, float w, float h, float rx, float ry, int points)
{
if (rx == 0 || ry == 0)
{
rectangle(mode, x, y, w, h);
return;
}
// Radius values that are more than half the rectangle's size aren't handled
// correctly (for now)...
if (w >= 0.02f)
rx = std::min(rx, w / 2.0f - 0.01f);
if (h >= 0.02f)
ry = std::min(ry, h / 2.0f - 0.01f);
points = std::max(points / 4, 1);
const float half_pi = static_cast<float>(LOVE_M_PI / 2);
float angle_shift = half_pi / ((float) points + 1.0f);
int num_coords = (points + 2) * 8;
float *coords = getScratchBuffer<float>(num_coords + 2);
float phi = .0f;
for (int i = 0; i <= points + 2; ++i, phi += angle_shift)
{
coords[2 * i + 0] = x + rx * (1 - cosf(phi));
coords[2 * i + 1] = y + ry * (1 - sinf(phi));
}
phi = half_pi;
for (int i = points + 2; i <= 2 * (points + 2); ++i, phi += angle_shift)
{
coords[2 * i + 0] = x + w - rx * (1 + cosf(phi));
coords[2 * i + 1] = y + ry * (1 - sinf(phi));
}
phi = 2 * half_pi;
for (int i = 2 * (points + 2); i <= 3 * (points + 2); ++i, phi += angle_shift)
{
coords[2 * i + 0] = x + w - rx * (1 + cosf(phi));
coords[2 * i + 1] = y + h - ry * (1 + sinf(phi));
}
phi = 3 * half_pi;
for (int i = 3 * (points + 2); i <= 4 * (points + 2); ++i, phi += angle_shift)
{
coords[2 * i + 0] = x + rx * (1 - cosf(phi));
coords[2 * i + 1] = y + h - ry * (1 + sinf(phi));
}
coords[num_coords + 0] = coords[0];
coords[num_coords + 1] = coords[1];
polygon(mode, coords, num_coords + 2);
}
void Graphics::rectangle(DrawMode mode, float x, float y, float w, float h, float rx, float ry)
{
rectangle(mode, x, y, w, h, rx, ry, calculateEllipsePoints(rx, ry));
}
void Graphics::circle(DrawMode mode, float x, float y, float radius, int points)
{
ellipse(mode, x, y, radius, radius, points);
}
void Graphics::circle(DrawMode mode, float x, float y, float radius)
{
ellipse(mode, x, y, radius, radius);
}
void Graphics::ellipse(DrawMode mode, float x, float y, float a, float b, int points)
{
float two_pi = (float) (LOVE_M_PI * 2);
if (points <= 0) points = 1;
float angle_shift = (two_pi / points);
float phi = .0f;
float *coords = getScratchBuffer<float>(2 * (points + 1));
for (int i = 0; i < points; ++i, phi += angle_shift)
{
coords[2*i+0] = x + a * cosf(phi);
coords[2*i+1] = y + b * sinf(phi);
}
coords[2*points+0] = coords[0];
coords[2*points+1] = coords[1];
polygon(mode, coords, (points + 1) * 2);
}
void Graphics::ellipse(DrawMode mode, float x, float y, float a, float b)
{
ellipse(mode, x, y, a, b, calculateEllipsePoints(a, b));
}
void Graphics::arc(DrawMode drawmode, ArcMode arcmode, float x, float y, float radius, float angle1, float angle2, int points)
{
// Nothing to display with no points or equal angles. (Or is there with line mode?)
if (points <= 0 || angle1 == angle2)
return;
// Oh, you want to draw a circle?
if (fabs(angle1 - angle2) >= 2.0f * (float) LOVE_M_PI)
{
circle(drawmode, x, y, radius, points);
return;
}
float angle_shift = (angle2 - angle1) / points;
// Bail on precision issues.
if (angle_shift == 0.0)
return;
// Prevent the connecting line from being drawn if a closed line arc has a
// small angle. Avoids some visual issues when connected lines are at sharp
// angles, due to the miter line join drawing code.
if (drawmode == DRAW_LINE && arcmode == ARC_CLOSED && fabsf(angle1 - angle2) < LOVE_TORAD(4))
arcmode = ARC_OPEN;
// Quick fix for the last part of a filled open arc not being drawn (because
// polygon(DRAW_FILL, ...) doesn't work without a closed loop of vertices.)
if (drawmode == DRAW_FILL && arcmode == ARC_OPEN)
arcmode = ARC_CLOSED;
float phi = angle1;
float *coords = nullptr;
int num_coords = 0;
const auto createPoints = [&](float *coordinates)
{
for (int i = 0; i <= points; ++i, phi += angle_shift)
{
coordinates[2 * i + 0] = x + radius * cosf(phi);
coordinates[2 * i + 1] = y + radius * sinf(phi);
}
};
if (arcmode == ARC_PIE)
{
num_coords = (points + 3) * 2;
coords = getScratchBuffer<float>(num_coords);
coords[0] = coords[num_coords - 2] = x;
coords[1] = coords[num_coords - 1] = y;
createPoints(coords + 2);
}
else if (arcmode == ARC_OPEN)
{
num_coords = (points + 1) * 2;
coords = getScratchBuffer<float>(num_coords);
createPoints(coords);
}
else // ARC_CLOSED
{
num_coords = (points + 2) * 2;
coords = getScratchBuffer<float>(num_coords);
createPoints(coords);
// Connect the ends of the arc.
coords[num_coords - 2] = coords[0];
coords[num_coords - 1] = coords[1];
}
polygon(drawmode, coords, num_coords);
}
void Graphics::arc(DrawMode drawmode, ArcMode arcmode, float x, float y, float radius, float angle1, float angle2)
{
float points = (float) calculateEllipsePoints(radius, radius);
// The amount of points is based on the fraction of the circle created by the arc.
float angle = fabsf(angle1 - angle2);
if (angle < 2.0f * (float) LOVE_M_PI)
points *= angle / (2.0f * (float) LOVE_M_PI);
arc(drawmode, arcmode, x, y, radius, angle1, angle2, (int) (points + 0.5f));
}
/// @param mode the draw mode
/// @param coords the coordinate array
/// @param count the number of coordinates/size of the array
void Graphics::polygon(DrawMode mode, const float *coords, size_t count)
{
// coords is an array of a closed loop of vertices, i.e.
// coords[count-2] = coords[0], coords[count-1] = coords[1]
if (mode == DRAW_LINE)
{
polyline(coords, count);
}
else
{
StreamDrawRequest req;
req.formats[0] = vertex::CommonFormat::XYf;
req.formats[1] = vertex::CommonFormat::RGBAub;
req.indexMode = vertex::TriangleIndexMode::FAN;
req.vertexCount = (int)count/2 - 1;
StreamVertexData data = requestStreamDraw(req);
const Matrix4 &t = getTransform();
t.transform((Vector *) data.stream[0], (const Vector *) coords, req.vertexCount);
Color c = toColor(getColor());
Color *colordata = (Color *) data.stream[1];
for (int i = 0; i < req.vertexCount; i++)
colordata[i] = c;
}
}
const Matrix4 &Graphics::getTransform() const
{
return transformStack.back();