*/
#include "objectrenderer.h"
+#include "view.h"
+
+using namespace std;
namespace IPDF
{
/**
* ObjectRenderer constructor
- * Note the ShaderProgram constructor which compiles the shaders for GPU rendering (if they exist)
+ * Note we cannot compile the shaders in the constructor because the Screen class needs to initialise GL and it has a ShaderProgram member
*/
ObjectRenderer::ObjectRenderer(const ObjectType & type,
const char * vert_glsl_file, const char * frag_glsl_file, const char * geom_glsl_file)
glDrawElements(GL_LINES, m_indexes.size()*2, GL_UNSIGNED_INT, 0);
}
+
/**
* Default implementation for rendering using CPU
*/
-void ObjectRenderer::RenderUsingCPU()
+void ObjectRenderer::RenderUsingCPU(const Objects & objects, const View & view, const CPURenderTarget & target)
{
Error("Cannot render objects of type %d on CPU", m_type);
+ //TODO: Render a rect or something instead?
}
/**
m_indexes.reserve(max_objects); //TODO: Can probably make this smaller? Or leave it out? Do we care?
// Initialise and resize the ibo (for GPU rendering)
+ m_ibo.Invalidate();
m_ibo.SetUsage(GraphicsBuffer::BufferUsageStaticDraw);
m_ibo.SetType(GraphicsBuffer::BufferTypeIndex);
m_ibo.Resize(max_objects * 2 * sizeof(uint32_t));
// Nothing is necessary for CPU rendering
}
+
+/**
+ * Rectangle (filled)
+ */
+void RectFilledRenderer::RenderUsingCPU(const Objects & objects, const View & view, const CPURenderTarget & target)
+{
+ for (unsigned i = 0; i < m_indexes.size(); ++i)
+ {
+ PixelBounds bounds(CPURenderBounds(objects.bounds[m_indexes[i]], view, target));
+ for (int64_t x = max(0L, bounds.x); x <= min(bounds.x+bounds.w, target.w-1); ++x)
+ {
+ for (int64_t y = max(0L, bounds.y); y <= min(bounds.y+bounds.h, target.h-1); ++y)
+ {
+ int index = (x+target.w*y)*4;
+ target.pixels[index+0] = 0;
+ target.pixels[index+1] = 0;
+ target.pixels[index+2] = 0;
+ target.pixels[index+3] = 255;
+ }
+ }
+ }
+}
+
+/**
+ * Rectangle (outine)
+ */
+void RectOutlineRenderer::RenderUsingCPU(const Objects & objects, const View & view, const CPURenderTarget & target)
+{
+ //Debug("Render %u outlined rectangles on CPU", m_indexes.size());
+ for (unsigned i = 0; i < m_indexes.size(); ++i)
+ {
+ PixelBounds bounds(CPURenderBounds(objects.bounds[m_indexes[i]], view, target));
+
+ // Using bresenham's lines now mainly because I want to see if they work
+ // top
+ ObjectRenderer::RenderLineOnCPU(bounds.x, bounds.y, bounds.x+bounds.w, bounds.y, target);
+ // bottom
+ ObjectRenderer::RenderLineOnCPU(bounds.x, bounds.y+bounds.h, bounds.x+bounds.w, bounds.y+bounds.h, target);
+ // left
+ ObjectRenderer::RenderLineOnCPU(bounds.x, bounds.y, bounds.x, bounds.y+bounds.h, target);
+ // right
+ ObjectRenderer::RenderLineOnCPU(bounds.x+bounds.w, bounds.y, bounds.x+bounds.w, bounds.y+bounds.h, target);
+
+ // Diagonal for testing (from bottom left to top right)
+ //ObjectRenderer::RenderLineOnCPU(bounds.x,bounds.y+bounds.h, bounds.x+bounds.w, bounds.y,target, C_BLUE);
+ //ObjectRenderer::RenderLineOnCPU(bounds.x+bounds.w, bounds.y+bounds.h, bounds.x, bounds.y, target,C_GREEN);
+ }
+}
+
+/**
+ * Circle (filled)
+ */
+void CircleFilledRenderer::RenderUsingCPU(const Objects & objects, const View & view, const CPURenderTarget & target)
+{
+ for (unsigned i = 0; i < m_indexes.size(); ++i)
+ {
+ PixelBounds bounds(CPURenderBounds(objects.bounds[m_indexes[i]], view, target));
+ int64_t centre_x = bounds.x + bounds.w / 2;
+ int64_t centre_y = bounds.y + bounds.h / 2;
+
+ //Debug("Centre is %d, %d", centre_x, centre_y);
+ //Debug("Bounds are %d,%d,%d,%d", bounds.x, bounds.y, bounds.w, bounds.h);
+ //Debug("Windos is %d,%d", target.w, target.h);
+ for (int64_t x = max(0L, bounds.x); x <= min(bounds.x+bounds.w, target.w-1); ++x)
+ {
+ for (int64_t y = max(0L, bounds.y); y <= min(bounds.y + bounds.h, target.h-1); ++y)
+ {
+ double dx = 2.0*(double)(x - centre_x)/(double)(bounds.w);
+ double dy = 2.0*(double)(y - centre_y)/(double)(bounds.h);
+ int64_t index = (x+target.w*y)*4;
+
+ if (dx*dx + dy*dy <= 1.0)
+ {
+ target.pixels[index+0] = 0;
+ target.pixels[index+1] = 0;
+ target.pixels[index+2] = 0;
+ target.pixels[index+3] = 255;
+
+ }
+ }
+ }
+ }
+}
+
+Rect ObjectRenderer::CPURenderBounds(const Rect & bounds, const View & view, const CPURenderTarget & target)
+{
+ Rect result = view.TransformToViewCoords(bounds);
+ result.x *= Real(target.w);
+ result.y *= Real(target.h);
+ result.w *= Real(target.w);
+ result.h *= Real(target.h);
+ return result;
+}
+
+
+/**
+ * Bezier curve
+ * Not sure how to apply De'Casteljau, will just use a bunch of Bresnham lines for now.
+ */
+void BezierRenderer::RenderUsingCPU(const Objects & objects, const View & view, const CPURenderTarget & target)
+{
+ //Warn("Rendering Beziers on CPU. Things may explode.");
+ for (unsigned i = 0; i < m_indexes.size(); ++i)
+ {
+ Rect bounds(CPURenderBounds(objects.bounds[m_indexes[i]], view, target));
+ PixelBounds pix_bounds(bounds);
+
+
+ Bezier control(objects.beziers[objects.data_indices[m_indexes[i]]], bounds);
+ //Debug("%s -> %s via %s", objects.beziers[objects.data_indices[m_indexes[i]]].Str().c_str(), control.Str().c_str(), bounds.Str().c_str());
+ // Draw a rectangle around the bezier for debugging the coord transforms
+ //ObjectRenderer::RenderLineOnCPU(pix_bounds.x, pix_bounds.y, pix_bounds.x+pix_bounds.w, pix_bounds.y, target);
+ //ObjectRenderer::RenderLineOnCPU(pix_bounds.x, pix_bounds.y+pix_bounds.h, pix_bounds.x+pix_bounds.w, pix_bounds.y+pix_bounds.h, target);
+ //ObjectRenderer::RenderLineOnCPU(pix_bounds.x, pix_bounds.y, pix_bounds.x, pix_bounds.y+pix_bounds.h, target);
+ //ObjectRenderer::RenderLineOnCPU(pix_bounds.x+pix_bounds.w, pix_bounds.y, pix_bounds.x+pix_bounds.w, pix_bounds.y+pix_bounds.h, target);
+
+ // Draw lines between the control points for debugging
+ //ObjectRenderer::RenderLineOnCPU((int64_t)control.x0, (int64_t)control.y0, (int64_t)control.x1, (int64_t)control.y1,target);
+ //ObjectRenderer::RenderLineOnCPU((int64_t)control.x1, (int64_t)control.y1, (int64_t)control.x2, (int64_t)control.y2,target);
+
+
+
+ Real x[2]; Real y[2];
+ control.Evaluate(x[0], y[0], Real(0));
+ for (unsigned j = 1; j <= 100; ++j)
+ {
+ control.Evaluate(x[j % 2],y[j % 2], Real(0.01)*j);
+ ObjectRenderer::RenderLineOnCPU((int64_t)x[0],(int64_t)y[0], (int64_t)x[1],(int64_t)y[1], target);
+ }
+
+ /*
+ Real u(0);
+ while (u < Real(1))
+ {
+ u += Real(1e-6);
+ Real x; Real y; control.Evaluate(x,y,u);
+ int64_t index = ((int64_t)x + (int64_t)y*target.w)*4;
+ if (index >= 0 && index < 4*(target.w*target.h))
+ {
+ target.pixels[index+0] = 0;
+ target.pixels[index+1] = 0;
+ target.pixels[index+2] = 0;
+ target.pixels[index+3] = 255;
+ }
+ }
+ */
+
+ }
+}
+
+/**
+ * For debug, save pixels to bitmap
+ */
+void ObjectRenderer::SaveBMP(const CPURenderTarget & target, const char * filename)
+{
+ SDL_Surface * surf = SDL_CreateRGBSurfaceFrom(target.pixels, target.w, target.h, 8*4, target.w*4,
+ #if SDL_BYTEORDER == SDL_LIL_ENDIAN
+ 0x000000ff, 0x0000ff00, 0x00ff0000, 0xff000000
+ #else
+ 0xff000000, 0x00ff0000, 0x0000ff00, 0x000000ff
+ #endif //SDL_BYTEORDER
+ );
+ if (surf == NULL)
+ Fatal("SDL_CreateRGBSurfaceFrom(pixels...) failed - %s", SDL_GetError());
+ if (SDL_SaveBMP(surf, filename) != 0)
+ Fatal("SDL_SaveBMP failed - %s", SDL_GetError());
+
+ // Cleanup
+ SDL_FreeSurface(surf);
+}
+
+/**
+ * Bresenham's lines
+ */
+void ObjectRenderer::RenderLineOnCPU(int64_t x0, int64_t y0, int64_t x1, int64_t y1, const CPURenderTarget & target, const Colour & colour, bool transpose)
+{
+ int64_t dx = x1 - x0;
+ int64_t dy = y1 - y0;
+ bool neg_m = (dy*dx < 0);
+ dy = abs(dy);
+ dx = abs(dx);
+
+ // If positive slope > 1, just swap x and y
+ if (dy > dx)
+ {
+ RenderLineOnCPU(y0,x0,y1,x1,target,colour,!transpose);
+ return;
+ }
+
+ int64_t two_dy = 2*dy;
+ int64_t p = two_dy - dx;
+ int64_t two_dxdy = 2*(dy-dx);
+ int64_t x; int64_t y; int64_t x_end;
+ int64_t width = (transpose ? target.h : target.w);
+ int64_t height = (transpose ? target.w : target.h);
+
+ uint8_t rgba[4];
+ rgba[0] = 255*colour.r;
+ rgba[1] = 255*colour.g;
+ rgba[2] = 255*colour.b;
+ rgba[3] = 255*colour.a;
+
+ if (x0 > x1)
+ {
+ x = x1;
+ y = y1;
+ x_end = x0;
+ }
+ else
+ {
+ x = x0;
+ y = y0;
+ x_end = x1;
+ }
+
+ if (x < 0)
+ {
+ if (x_end < 0) return;
+ y = (neg_m ? y - (dy*-x)/dx : y + (dy*-x)/dx);
+ x = 0;
+ }
+
+ if (x_end > width)
+ {
+ if (x > width) return;
+ x_end = width-1;
+ }
+
+ // TODO: Avoid extra inner conditionals
+ do
+ {
+ if (x >= 0 && x < width && y >= 0 && y < height)
+ {
+ int64_t index = (transpose ? (y + x*target.w)*4 : (x + y*target.w)*4);
+ for (int i = 0; i < 4; ++i)
+ target.pixels[index+i] = rgba[i];
+ }
+
+ if (p < 0)
+ p += two_dy;
+ else
+ {
+ if (neg_m) --y; else ++y;
+ p += two_dxdy;
+ }
+ } while (++x < x_end);
+}
+
}
git.ucc.asn.au / ipdf / code.git / blobdiff
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