638 lines
20 KiB
C++
638 lines
20 KiB
C++
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#include <cstdint>
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#include <vector>
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#include <cstdio>
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#include <cmath>
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#include <stdexcept>
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#include <cassert>
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#define SQ_BASE_ADDRESS 0
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#define SPAN_SORT_CFG 0
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#define PVR_SET(x, y) (void)(x); (void)(y)
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struct Vertex {
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uint32_t flags;
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float xyz[3];
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float uv[2];
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float w;
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uint8_t bgra[4];
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};
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struct {
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float hwidth;
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float x_plus_hwidth;
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float hheight;
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float y_plus_hheight;
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} VIEWPORT = {320, 320, 240, 240};
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struct VideoMode {
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float height;
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};
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static VideoMode* GetVideoMode() {
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static VideoMode mode = {320.0f};
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return &mode;
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}
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enum GPUCommand {
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GPU_CMD_POLYHDR = 0x80840000,
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GPU_CMD_VERTEX = 0xe0000000,
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GPU_CMD_VERTEX_EOL = 0xf0000000,
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GPU_CMD_USERCLIP = 0x20000000,
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GPU_CMD_MODIFIER = 0x80000000,
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GPU_CMD_SPRITE = 0xA0000000
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};
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static std::vector<Vertex> sent;
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static inline void interpolateColour(const uint32_t* a, const uint32_t* b, const float t, uint32_t* out) {
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const static uint32_t MASK1 = 0x00FF00FF;
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const static uint32_t MASK2 = 0xFF00FF00;
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const uint32_t f2 = 256 * t;
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const uint32_t f1 = 256 - f2;
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*out = (((((*a & MASK1) * f1) + ((*b & MASK1) * f2)) >> 8) & MASK1) |
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(((((*a & MASK2) * f1) + ((*b & MASK2) * f2)) >> 8) & MASK2);
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}
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static inline void _glClipEdge(const Vertex* v1, const Vertex* v2, Vertex* vout) {
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/* Clipping time! */
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const float d0 = v1->w + v1->xyz[2];
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const float d1 = v2->w + v2->xyz[2];
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const float sign = ((2.0f * (d1 < d0)) - 1.0f);
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const float epsilon = -0.00001f * sign;
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const float n = (d0 - d1);
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const float r = (1.f / sqrtf(n * n)) * sign;
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float t = fmaf(r, d0, epsilon);
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vout->xyz[0] = fmaf(v2->xyz[0] - v1->xyz[0], t, v1->xyz[0]);
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vout->xyz[1] = fmaf(v2->xyz[1] - v1->xyz[1], t, v1->xyz[1]);
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vout->xyz[2] = fmaf(v2->xyz[2] - v1->xyz[2], t, v1->xyz[2]);
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vout->w = fmaf(v2->w - v1->w, t, v1->w);
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vout->uv[0] = fmaf(v2->uv[0] - v1->uv[0], t, v1->uv[0]);
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vout->uv[1] = fmaf(v2->uv[1] - v1->uv[1], t, v1->uv[1]);
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interpolateColour((uint32_t*) v1->bgra, (uint32_t*) v2->bgra, t, (uint32_t*) vout->bgra);
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}
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bool glIsVertex(const uint32_t flags) {
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return flags == GPU_CMD_VERTEX_EOL || flags == GPU_CMD_VERTEX;
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}
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bool glIsLastVertex(const uint32_t flags) {
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return flags == GPU_CMD_VERTEX_EOL;
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}
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void _glSubmitHeaderOrVertex(volatile uint32_t*, Vertex* vtx) {
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sent.push_back(*vtx);
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}
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float _glFastInvert(float x) {
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return (1.f / __builtin_sqrtf(x * x));
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}
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void _glPerspectiveDivideVertex(Vertex* vertex, const float h) {
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const float f = _glFastInvert(vertex->w);
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/* Convert to NDC and apply viewport */
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vertex->xyz[0] = __builtin_fmaf(
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VIEWPORT.hwidth, vertex->xyz[0] * f, VIEWPORT.x_plus_hwidth
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);
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vertex->xyz[1] = h - __builtin_fmaf(
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VIEWPORT.hheight, vertex->xyz[1] * f, VIEWPORT.y_plus_hheight
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);
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/* Orthographic projections need to use invZ otherwise we lose
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the depth information. As w == 1, and clip-space range is -w to +w
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we add 1.0 to the Z to bring it into range. We add a little extra to
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avoid a divide by zero.
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*/
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vertex->xyz[2] = (vertex->w == 1.0f) ? _glFastInvert(1.0001f + vertex->xyz[2]) : f;
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}
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void memcpy_vertex(Vertex* dst, Vertex* src) {
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*dst = *src;
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}
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/* Zclipping is so difficult to get right, that self sample tests all the cases of clipping and makes sure that things work as expected */
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#ifdef __DREAMCAST__
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static volatile int *pvrdmacfg = (int*)0xA05F6888;
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static volatile int *qacr = (int*)0xFF000038;
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#else
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static int pvrdmacfg[2];
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static int qacr[2];
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#endif
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void SceneListSubmit(void* src, int n) {
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/* You need at least a header, and 3 vertices to render anything */
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if(n < 4) {
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return;
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}
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const float h = GetVideoMode()->height;
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PVR_SET(SPAN_SORT_CFG, 0x0);
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//Set PVR DMA registers
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pvrdmacfg[0] = 1;
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pvrdmacfg[1] = 1;
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//Set QACR registers
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qacr[1] = qacr[0] = 0x11;
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volatile uint32_t *d = SQ_BASE_ADDRESS;
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int8_t queue_head = 0;
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int8_t queue_tail = 0;
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/* The most vertices ever in the queue is 5 (as some clipping operations
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* produce and additional couple of vertice, but we add one more so the ring buffer doesn't
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* trip over itself (e.g. if tail == head we can guarantee it's empty, not full) */
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Vertex __attribute__((aligned(32))) queue[4];
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const int queue_capacity = sizeof(queue) / sizeof(Vertex);
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Vertex* vertex = (Vertex*) src;
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uint32_t visible_mask = 0;
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#if CLIP_DEBUG
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for(int i = 0; i < n; ++i) {
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fprintf(stderr, "{%f, %f, %f, %f}, // %x (%x)\n", vertex[i].xyz[0], vertex[i].xyz[1], vertex[i].xyz[2], vertex[i].w, vertex[i].flags, &vertex[i]);
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}
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fprintf(stderr, "----\n");
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#endif
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while(n--) {
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bool last_vertex = false;
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memcpy_vertex(queue + queue_tail, vertex);
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++vertex;
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switch(queue[queue_tail].flags) {
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case GPU_CMD_POLYHDR:
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_glSubmitHeaderOrVertex(d, &queue[queue_tail]);
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break;
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case GPU_CMD_VERTEX_EOL:
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last_vertex = true;
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case GPU_CMD_VERTEX:
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visible_mask = (visible_mask >> 1) | (queue[queue_tail].xyz[2] >= -queue[queue_tail].w) << 2;
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assert(visible_mask < 15);
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queue_tail = (queue_tail + 1) % queue_capacity;
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default:
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break;
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}
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int counter = (queue_tail - queue_head + queue_capacity) % queue_capacity;
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if(counter < 3) {
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continue;
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}
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#if CLIP_DEBUG
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fprintf(stderr, "%d\n", visible_mask);
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#endif
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Vertex __attribute__((aligned(32))) a, b; // Scratch vertices
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switch(visible_mask) {
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case 0:
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break;
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case 7:
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/* All visible, push the first vertex and move on */
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_glPerspectiveDivideVertex(&queue[queue_head], h);
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_glSubmitHeaderOrVertex(d, &queue[queue_head]);
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if(last_vertex) {
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/* If this was the last vertex in the strip, we need to flush the queue and then
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restart it again */
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int v1 = (queue_head + 1) % queue_capacity;
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int v2 = (queue_head + 2) % queue_capacity;
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_glPerspectiveDivideVertex(&queue[v1], h);
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_glSubmitHeaderOrVertex(d, &queue[v1]);
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_glPerspectiveDivideVertex(&queue[v2], h);
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_glSubmitHeaderOrVertex(d, &queue[v2]);
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}
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break;
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case 1:
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/* First vertex was visible */
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{
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Vertex* v0 = &queue[queue_head];
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Vertex* v1 = &queue[(queue_head + 1) % queue_capacity];
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Vertex* v2 = &queue[(queue_head + 2) % queue_capacity];
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_glClipEdge(v0, v1, &a);
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_glClipEdge(v2, v0, &b);
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a.flags = GPU_CMD_VERTEX;
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/* If v2 was the last in the strip, then b should be. If it wasn't
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we'll create a degenerate triangle by adding b twice in a row so that the
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strip processing will continue correctly after crossing the plane so it can
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cross back*/
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b.flags = v2->flags;
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_glPerspectiveDivideVertex(v0, h);
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_glPerspectiveDivideVertex(&a, h);
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_glPerspectiveDivideVertex(&b, h);
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_glSubmitHeaderOrVertex(d, v0);
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_glSubmitHeaderOrVertex(d, &a);
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_glSubmitHeaderOrVertex(d, &b);
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_glSubmitHeaderOrVertex(d, &b);
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}
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break;
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case 2:
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/* Second vertex was visible. In self case we need to create a triangle and produce
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two new vertices: 1-2, and 2-3. */
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{
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Vertex* v0 = &queue[queue_head];
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const Vertex* v1 = &queue[(queue_head + 1) % queue_capacity];
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const Vertex* v2 = &queue[(queue_head + 2) % queue_capacity];
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_glClipEdge(v0, v1, &a);
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_glClipEdge(v1, v2, &b);
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a.flags = GPU_CMD_VERTEX;
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b.flags = v2->flags;
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_glPerspectiveDivideVertex(v0, h);
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_glPerspectiveDivideVertex(&a, h);
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_glPerspectiveDivideVertex(&b, h);
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_glSubmitHeaderOrVertex(d, &a);
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_glSubmitHeaderOrVertex(d, v0);
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_glSubmitHeaderOrVertex(d, &b);
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}
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break;
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case 3: /* First and second vertex were visible */
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{
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Vertex* v0 = &queue[queue_head];
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Vertex __attribute__((aligned(32))) v1 = queue[(queue_head + 1) % queue_capacity];
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Vertex* v2 = &queue[(queue_head + 2) % queue_capacity];
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_glClipEdge(&v1, v2, &a);
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_glClipEdge(v2, v0, &b);
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a.flags = v2->flags;
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b.flags = GPU_CMD_VERTEX;
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_glPerspectiveDivideVertex(v0, h);
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_glPerspectiveDivideVertex(&v1, h);
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_glPerspectiveDivideVertex(&a, h);
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_glPerspectiveDivideVertex(&b, h);
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_glSubmitHeaderOrVertex(d, v0);
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_glSubmitHeaderOrVertex(d, &v1);
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_glSubmitHeaderOrVertex(d, &b);
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_glSubmitHeaderOrVertex(d, &v1);
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_glSubmitHeaderOrVertex(d, &a);
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}
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break;
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case 4:
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/* Third vertex was visible. */
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{
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Vertex* v0 = &queue[queue_head];
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Vertex* v1 = &queue[(queue_head + 1) % queue_capacity];
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Vertex __attribute__((aligned(32))) v2 = queue[(queue_head + 2) % queue_capacity];
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_glClipEdge(&v2, v0, &a);
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_glClipEdge(v1, &v2, &b);
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a.flags = GPU_CMD_VERTEX;
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b.flags = GPU_CMD_VERTEX;
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_glPerspectiveDivideVertex(&v2, h);
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_glPerspectiveDivideVertex(&a, h);
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_glPerspectiveDivideVertex(&b, h);
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_glSubmitHeaderOrVertex(d, &a);
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_glSubmitHeaderOrVertex(d, &a);
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_glSubmitHeaderOrVertex(d, &b);
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_glSubmitHeaderOrVertex(d, &v2);
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}
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break;
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case 5: /* First and third vertex were visible */
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{
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Vertex* v0 = &queue[queue_head];
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Vertex* v1 = &queue[(queue_head + 1) % queue_capacity];
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Vertex __attribute__((aligned(32))) v2 = queue[(queue_head + 2) % queue_capacity];
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_glClipEdge(v0, v1, &a);
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_glClipEdge(v1, &v2, &b);
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a.flags = GPU_CMD_VERTEX;
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b.flags = GPU_CMD_VERTEX;
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_glPerspectiveDivideVertex(v0, h);
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_glPerspectiveDivideVertex(&v2, h);
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_glPerspectiveDivideVertex(&a, h);
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_glPerspectiveDivideVertex(&b, h);
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_glSubmitHeaderOrVertex(d, v0);
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_glSubmitHeaderOrVertex(d, &a);
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uint32_t v2_flags = v2.flags;
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v2.flags = GPU_CMD_VERTEX;
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_glSubmitHeaderOrVertex(d, &v2);
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v2.flags = v2_flags;
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_glSubmitHeaderOrVertex(d, &b);
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_glSubmitHeaderOrVertex(d, &v2);
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}
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break;
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case 6: /* Second and third vertex were visible */
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{
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Vertex* v0 = &queue[queue_head];
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Vertex __attribute__((aligned(32))) v1 = queue[(queue_head + 1) % queue_capacity];
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Vertex __attribute__((aligned(32))) v2 = queue[(queue_head + 2) % queue_capacity];
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_glClipEdge(v0, &v1, &a);
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_glClipEdge(&v2, v0, &b);
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a.flags = GPU_CMD_VERTEX;
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b.flags = GPU_CMD_VERTEX;
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_glPerspectiveDivideVertex(&v1, h);
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_glPerspectiveDivideVertex(&v2, h);
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_glPerspectiveDivideVertex(&a, h);
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_glPerspectiveDivideVertex(&b, h);
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_glSubmitHeaderOrVertex(d, &a);
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_glSubmitHeaderOrVertex(d, &v1);
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_glSubmitHeaderOrVertex(d, &b);
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_glSubmitHeaderOrVertex(d, &v1);
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_glSubmitHeaderOrVertex(d, &v2);
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}
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break;
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default:
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break;
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}
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if(last_vertex) {
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visible_mask = queue_head = queue_tail = 0;
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} else {
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queue_head = (queue_head + 1) % queue_capacity;
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}
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}
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}
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struct VertexTmpl {
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VertexTmpl(float x, float y, float z, float w):
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x(x), y(y), z(z), w(w) {}
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float x, y, z, w;
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};
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std::vector<Vertex> make_vertices(const std::vector<VertexTmpl>& verts) {
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std::vector<Vertex> result;
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Vertex r;
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r.flags = GPU_CMD_POLYHDR;
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result.push_back(r);
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for(auto& v: verts) {
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r.flags = GPU_CMD_VERTEX;
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r.xyz[0] = v.x;
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r.xyz[1] = v.y;
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r.xyz[2] = v.z;
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r.uv[0] = 0.0f;
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r.uv[1] = 0.0f;
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r.w = v.w;
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result.push_back(r);
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}
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result.back().flags = GPU_CMD_VERTEX_EOL;
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return result;
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}
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template<typename T, typename U>
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void check_equal(const T& lhs, const U& rhs) {
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if(lhs != rhs) {
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throw std::runtime_error("Assertion failed");
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}
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}
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template<>
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void check_equal(const Vertex& lhs, const Vertex& rhs) {
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if(lhs.xyz[0] != rhs.xyz[0] ||
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lhs.xyz[1] != rhs.xyz[1] ||
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lhs.xyz[2] != rhs.xyz[2] ||
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lhs.w != rhs.w) {
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throw std::runtime_error("Assertion failed");
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}
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}
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bool test_clip_case_001() {
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/* The first vertex is visible only */
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sent.clear();
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auto data = make_vertices({
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{0.000000, -2.414213, 3.080808, 5.000000},
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{-4.526650, -2.414213, -7.121212, -5.000000},
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{4.526650, -2.414213, -7.121212, -5.000000}
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});
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SceneListSubmit(&data[0], data.size());
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check_equal(sent.size(), 5);
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check_equal(sent[0].flags, GPU_CMD_POLYHDR);
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check_equal(sent[1].flags, GPU_CMD_VERTEX);
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check_equal(sent[2].flags, GPU_CMD_VERTEX);
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// Because we're sending a single triangle, we end up sending a
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// degenerate final vert. But if we were sending more than one triangle
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// this would be GPU_CMD_VERTEX twice
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check_equal(sent[3].flags, GPU_CMD_VERTEX_EOL);
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check_equal(sent[4].flags, GPU_CMD_VERTEX_EOL);
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check_equal(sent[3], sent[4]);
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return true;
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}
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bool test_clip_case_010() {
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/* The third vertex is visible only */
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sent.clear();
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auto data = make_vertices({
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{-4.526650, -2.414213, -7.121212, -5.000000},
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{0.000000, -2.414213, 3.080808, 5.000000},
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{4.526650, -2.414213, -7.121212, -5.000000}
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});
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SceneListSubmit(&data[0], data.size());
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check_equal(sent.size(), 4);
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check_equal(sent[0].flags, GPU_CMD_POLYHDR);
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check_equal(sent[1].flags, GPU_CMD_VERTEX);
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check_equal(sent[2].flags, GPU_CMD_VERTEX);
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check_equal(sent[3].flags, GPU_CMD_VERTEX_EOL);
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return true;
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}
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bool test_clip_case_100() {
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/* The third vertex is visible only */
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sent.clear();
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auto data = make_vertices({
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{-4.526650, -2.414213, -7.121212, -5.000000},
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{4.526650, -2.414213, -7.121212, -5.000000},
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{0.000000, -2.414213, 3.080808, 5.000000}
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});
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SceneListSubmit(&data[0], data.size());
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check_equal(sent.size(), 5);
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check_equal(sent[0].flags, GPU_CMD_POLYHDR);
|
|
check_equal(sent[1].flags, GPU_CMD_VERTEX);
|
|
check_equal(sent[2].flags, GPU_CMD_VERTEX);
|
|
|
|
// Because we're sending a single triangle, we end up sending a
|
|
// degenerate final vert. But if we were sending more than one triangle
|
|
// this would be GPU_CMD_VERTEX twice
|
|
check_equal(sent[3].flags, GPU_CMD_VERTEX);
|
|
check_equal(sent[4].flags, GPU_CMD_VERTEX_EOL);
|
|
check_equal(sent[1], sent[2]);
|
|
return true;
|
|
}
|
|
|
|
bool test_clip_case_110() {
|
|
/* 2nd and 3rd visible */
|
|
sent.clear();
|
|
|
|
auto data = make_vertices({
|
|
{0.0, -2.414213, -7.121212, -5.000000},
|
|
{-4.526650, -2.414213, 3.080808, 5.000000},
|
|
{4.526650, -2.414213, 3.080808, 5.000000}
|
|
});
|
|
|
|
SceneListSubmit(&data[0], data.size());
|
|
|
|
check_equal(sent.size(), 6);
|
|
check_equal(sent[0].flags, GPU_CMD_POLYHDR);
|
|
check_equal(sent[1].flags, GPU_CMD_VERTEX);
|
|
check_equal(sent[2].flags, GPU_CMD_VERTEX);
|
|
check_equal(sent[3].flags, GPU_CMD_VERTEX);
|
|
check_equal(sent[4].flags, GPU_CMD_VERTEX);
|
|
check_equal(sent[5].flags, GPU_CMD_VERTEX_EOL);
|
|
check_equal(sent[2], sent[4]);
|
|
return true;
|
|
}
|
|
|
|
bool test_clip_case_011() {
|
|
/* 1st and 2nd visible */
|
|
sent.clear();
|
|
|
|
auto data = make_vertices({
|
|
{-4.526650, -2.414213, 3.080808, 5.000000},
|
|
{4.526650, -2.414213, 3.080808, 5.000000},
|
|
{0.0, -2.414213, -7.121212, -5.000000}
|
|
});
|
|
|
|
SceneListSubmit(&data[0], data.size());
|
|
|
|
check_equal(sent.size(), 6);
|
|
check_equal(sent[0].flags, GPU_CMD_POLYHDR);
|
|
check_equal(sent[1].flags, GPU_CMD_VERTEX);
|
|
check_equal(sent[2].flags, GPU_CMD_VERTEX);
|
|
check_equal(sent[3].flags, GPU_CMD_VERTEX);
|
|
check_equal(sent[4].flags, GPU_CMD_VERTEX);
|
|
check_equal(sent[5].flags, GPU_CMD_VERTEX_EOL);
|
|
check_equal(sent[2], sent[4]);
|
|
return true;
|
|
}
|
|
|
|
bool test_clip_case_101() {
|
|
/* 1st and 3rd visible */
|
|
sent.clear();
|
|
|
|
auto data = make_vertices({
|
|
{-4.526650, -2.414213, 3.080808, 5.000000},
|
|
{0.0, -2.414213, -7.121212, -5.000000},
|
|
{4.526650, -2.414213, 3.080808, 5.000000},
|
|
});
|
|
|
|
SceneListSubmit(&data[0], data.size());
|
|
|
|
check_equal(sent.size(), 6);
|
|
check_equal(sent[0].flags, GPU_CMD_POLYHDR);
|
|
check_equal(sent[1].flags, GPU_CMD_VERTEX);
|
|
check_equal(sent[2].flags, GPU_CMD_VERTEX);
|
|
check_equal(sent[3].flags, GPU_CMD_VERTEX);
|
|
check_equal(sent[4].flags, GPU_CMD_VERTEX);
|
|
check_equal(sent[5].flags, GPU_CMD_VERTEX_EOL);
|
|
check_equal(sent[3], sent[5]);
|
|
return true;
|
|
}
|
|
|
|
bool test_clip_case_111() {
|
|
/* 1st and 3rd visible */
|
|
sent.clear();
|
|
|
|
auto data = make_vertices({
|
|
{-4.526650, -2.414213, 3.080808, 5.000000},
|
|
{0.0, -2.414213, -7.121212, 8.000000},
|
|
{4.526650, -2.414213, 3.080808, 5.000000},
|
|
});
|
|
|
|
SceneListSubmit(&data[0], data.size());
|
|
|
|
check_equal(sent.size(), 4);
|
|
check_equal(sent[0].flags, GPU_CMD_POLYHDR);
|
|
check_equal(sent[1].flags, GPU_CMD_VERTEX);
|
|
check_equal(sent[2].flags, GPU_CMD_VERTEX);
|
|
check_equal(sent[3].flags, GPU_CMD_VERTEX_EOL);
|
|
return true;
|
|
}
|
|
|
|
|
|
bool test_start_behind() {
|
|
/* Triangle behind the plane, but the strip continues in front */
|
|
sent.clear();
|
|
|
|
auto data = make_vertices({
|
|
{-3.021717, -2.414213, -10.155344, -9.935254},
|
|
{5.915236, -2.414213, -9.354721, -9.136231},
|
|
{-5.915236, -2.414213, -0.264096, -0.063767},
|
|
{3.021717, -2.414213, 0.536527, 0.735255},
|
|
{-7.361995, -2.414213, 4.681529, 4.871976},
|
|
{1.574958, -2.414213, 5.482152, 5.670999},
|
|
});
|
|
|
|
SceneListSubmit(&data[0], data.size());
|
|
|
|
return true;
|
|
}
|
|
|
|
bool test_longer_strip() {
|
|
sent.clear();
|
|
|
|
auto data = make_vertices({
|
|
{-4.384623, -2.414213, -5.699644, -5.488456},
|
|
{4.667572, -2.414213, -5.621354, -5.410322},
|
|
{-4.667572, -2.414213, 4.319152, 4.510323},
|
|
{4.384623, -2.414213, 4.397442, 4.588456},
|
|
{-4.809045, -2.414213, 9.328549, 9.509711},
|
|
{4.243149, -2.414213, 9.406840, 9.587846},
|
|
});
|
|
|
|
SceneListSubmit(&data[0], data.size());
|
|
|
|
return true;
|
|
}
|
|
|
|
int main(int argc, char* argv[]) {
|
|
// test_clip_case_000();
|
|
test_clip_case_001();
|
|
test_clip_case_010();
|
|
test_clip_case_100();
|
|
test_clip_case_110();
|
|
test_clip_case_011();
|
|
test_clip_case_101();
|
|
test_clip_case_111();
|
|
|
|
test_start_behind();
|
|
test_longer_strip();
|
|
|
|
return 0;
|
|
}
|