84 lines
2.5 KiB
C++
84 lines
2.5 KiB
C++
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#ifndef RENDERER_H
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#define RENDERER_H
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#include "fastmath.hpp"
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#include "model.hpp"
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#include "polygon.hpp"
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#include "rendertarget.hpp"
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#include <cstring>
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#include <memory.h>
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#define SCREEN_SPACE_SIZE 8.0
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class Renderer {
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public:
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Rendertarget *target;
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bool clearTarget = true;
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Renderer() : clearTarget(false) {}
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void toScreenSpace(vec3 *p) {
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p->x() = p->x() / p->z() * decimal(SCREEN_SPACE_SIZE) +
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decimal(SCREEN_SPACE_SIZE);
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p->y() = p->y() / p->z() * decimal(SCREEN_SPACE_SIZE) +
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decimal(SCREEN_SPACE_SIZE);
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p->z() = decimal(1.0);
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}
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void render(const model *model) {
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decimal widthScale =
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decimal(SCREEN_SPACE_SIZE * 2) / decimal((float)target->width);
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decimal heightScale =
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decimal(SCREEN_SPACE_SIZE * 2) / decimal((float)target->height);
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decimal invWidthScale =
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decimal((float)(target->width / SCREEN_SPACE_SIZE / 2));
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decimal invHeightScale =
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decimal((float)(target->height / SCREEN_SPACE_SIZE / 2));
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if (clearTarget) {
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memset((wchar_t *)target->pixels, 0,
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target->height * target->width * sizeof(target[0]));
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}
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vec3 verts[model->verts.size()] = {};
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std::copy(model->verts.begin(), model->verts.end(), verts);
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for (int i = 0; i < model->verts.size(); i++) {
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toScreenSpace(verts + i);
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}
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polygon testP;
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for (int f = 0; f < model->faces.size(); f += 3) {
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for (int p = 0; p < 3; p++) {
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testP.points[p] = verts[model->faces[f + p]];
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}
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testP.calcDelta();
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int startX = (testP.bounding[0] * invWidthScale).i >> SHIFT_AMOUNT;
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int endX = (testP.bounding[1] * invWidthScale).i >> SHIFT_AMOUNT;
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int startY = (testP.bounding[2] * invHeightScale).i >> SHIFT_AMOUNT;
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int endY = (testP.bounding[3] * invHeightScale).i >> SHIFT_AMOUNT;
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vec3 pos = vec3(testP.bounding[0], testP.bounding[2], 0.0);
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for (int x = startX; x < endX; x++) {
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for (int y = startY; y < endY; y++) {
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if (testP.contains(pos)) {
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target->set(x, y, vec3(0.0, 255.0, 0.0));
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}
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pos.y() += heightScale;
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}
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pos.y() = decimal(testP.bounding[2]);
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pos.x() += widthScale;
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}
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}
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}
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};
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#endif
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