459 lines
14 KiB
C
459 lines
14 KiB
C
#include "../platform.h"
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#include "sh4.h"
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#define CLIP_DEBUG 0
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#define TA_SQ_ADDR (unsigned int *)(void *) \
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(0xe0000000 | (((unsigned long)0x10000000) & 0x03ffffe0))
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#define QACRTA ((((unsigned int)0x10000000)>>26)<<2)&0x1c
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#define PVR_VERTEX_BUF_SIZE 2560 * 256
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#define likely(x) __builtin_expect(!!(x), 1)
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#define unlikely(x) __builtin_expect(!!(x), 0)
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GL_FORCE_INLINE bool glIsVertex(const float flags) {
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return flags == GPU_CMD_VERTEX_EOL || flags == GPU_CMD_VERTEX;
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}
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GL_FORCE_INLINE bool glIsLastVertex(const float flags) {
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return flags == GPU_CMD_VERTEX_EOL;
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}
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void InitGPU(_Bool autosort, _Bool fsaa) {
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pvr_init_params_t params = {
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/* Enable opaque and translucent polygons with size 32 and 32 */
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{PVR_BINSIZE_32, PVR_BINSIZE_0, PVR_BINSIZE_32, PVR_BINSIZE_0, PVR_BINSIZE_32},
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PVR_VERTEX_BUF_SIZE, /* Vertex buffer size */
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0, /* No DMA */
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fsaa, /* No FSAA */
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(autosort) ? 0 : 1 /* Disable translucent auto-sorting to match traditional GL */
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};
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pvr_init(¶ms);
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}
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void SceneBegin() {
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pvr_wait_ready();
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pvr_scene_begin();
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QACR0 = QACRTA;
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QACR1 = QACRTA;
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}
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void SceneListBegin(GPUList list) {
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pvr_list_begin(list);
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}
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GL_FORCE_INLINE void _glPerspectiveDivideVertex(Vertex* vertex, const float h) {
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const float f = MATH_Fast_Invert(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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if(unlikely(vertex->w == 1.0f)) {
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vertex->xyz[2] = MATH_Fast_Invert(1.0001f + vertex->xyz[2]);
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} else {
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vertex->xyz[2] = f;
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}
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}
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static uint32_t *d; // SQ target
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GL_FORCE_INLINE void _glSubmitHeaderOrVertex(const Vertex* v) {
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#ifndef NDEBUG
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assert(!isnan(v->xyz[2]));
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assert(!isnan(v->w));
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#endif
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#if CLIP_DEBUG
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printf("Submitting: %x (%x)\n", v, v->flags);
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#endif
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uint32_t *s = (uint32_t*) v;
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__asm__("pref @%0" : : "r"(s + 8)); /* prefetch 32 bytes for next loop */
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d[0] = *(s++);
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d[1] = *(s++);
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d[2] = *(s++);
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d[3] = *(s++);
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d[4] = *(s++);
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d[5] = *(s++);
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d[6] = *(s++);
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d[7] = *(s++);
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__asm__("pref @%0" : : "r"(d));
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d += 8;
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}
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static struct {
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Vertex* v;
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int visible;
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} triangle[3];
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static int tri_count = 0;
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static int strip_count = 0;
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GL_FORCE_INLINE void interpolateColour(const uint8_t* v1, const uint8_t* v2, const float t, uint8_t* out) {
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const int MASK1 = 0x00FF00FF;
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const int MASK2 = 0xFF00FF00;
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const int f2 = 256 * t;
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const int f1 = 256 - f2;
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const uint32_t a = *(uint32_t*) v1;
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const uint32_t b = *(uint32_t*) v2;
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*((uint32_t*) 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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GL_FORCE_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 epsilon = (d0 < d1) ? -0.00001f : 0.00001f;
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float t = MATH_Fast_Divide(d0, (d0 - d1)) + epsilon;
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t = (t > 1.0f) ? 1.0f : t;
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t = (t < 0.0f) ? 0.0f : t;
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vout->xyz[0] = __builtin_fmaf(v2->xyz[0] - v1->xyz[0], t, v1->xyz[0]);
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vout->xyz[1] = __builtin_fmaf(v2->xyz[1] - v1->xyz[1], t, v1->xyz[1]);
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vout->xyz[2] = __builtin_fmaf(v2->xyz[2] - v1->xyz[2], t, v1->xyz[2]);
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vout->w = __builtin_fmaf(v2->w - v1->w, t, v1->w);
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vout->uv[0] = __builtin_fmaf(v2->uv[0] - v1->uv[0], t, v1->uv[0]);
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vout->uv[1] = __builtin_fmaf(v2->uv[1] - v1->uv[1], t, v1->uv[1]);
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interpolateColour(v1->bgra, v2->bgra, t, vout->bgra);
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}
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GL_FORCE_INLINE void ClearTriangle() {
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tri_count = 0;
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}
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GL_FORCE_INLINE void ShiftTriangle() {
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if(!tri_count) {
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return;
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}
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tri_count--;
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triangle[0] = triangle[1];
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triangle[1] = triangle[2];
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#ifndef NDEBUG
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triangle[2].v = NULL;
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triangle[2].visible = false;
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#endif
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}
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GL_FORCE_INLINE void ShiftRotateTriangle() {
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if(!tri_count) {
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return;
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}
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if(triangle[0].v < triangle[1].v) {
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triangle[0] = triangle[2];
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} else {
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triangle[1] = triangle[2];
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}
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tri_count--;
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}
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void SceneListSubmit(void* src, int n) {
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/* Do everything, everywhere, all at once */
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/* Prep store queues */
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d = (uint32_t*) TA_SQ_ADDR;
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/* Perform perspective divide on each vertex */
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Vertex* vertex = (Vertex*) src;
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const float h = GetVideoMode()->height;
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if(!ZNEAR_CLIPPING_ENABLED) {
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for(int i = 0; i < n; ++i, ++vertex) {
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PREFETCH(vertex + 1);
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if(glIsVertex(vertex->flags)) {
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_glPerspectiveDivideVertex(vertex, h);
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}
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_glSubmitHeaderOrVertex(vertex);
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}
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/* Wait for both store queues to complete */
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d = (uint32_t *)0xe0000000;
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d[0] = d[8] = 0;
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return;
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}
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tri_count = 0;
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strip_count = 0;
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#if CLIP_DEBUG
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printf("----\n");
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#endif
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for(int i = 0; i < n; ++i, ++vertex) {
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PREFETCH(vertex + 1);
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bool is_last_in_strip = glIsLastVertex(vertex->flags);
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/* Wait until we fill the triangle */
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if(tri_count < 3) {
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if(likely(glIsVertex(vertex->flags))) {
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triangle[tri_count].v = vertex;
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triangle[tri_count].visible = vertex->xyz[2] >= -vertex->w;
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tri_count++;
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strip_count++;
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} else {
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/* We hit a header */
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tri_count = 0;
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strip_count = 0;
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_glSubmitHeaderOrVertex(vertex);
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}
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if(tri_count < 3) {
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continue;
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}
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}
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#if CLIP_DEBUG
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printf("SC: %d\n", strip_count);
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#endif
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/* If we got here, then triangle contains 3 vertices */
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int visible_mask = triangle[0].visible | (triangle[1].visible << 1) | (triangle[2].visible << 2);
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if(visible_mask == 7) {
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#if CLIP_DEBUG
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printf("Visible\n");
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#endif
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/* All the vertices are visible! We divide and submit v0, then shift */
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_glPerspectiveDivideVertex(vertex - 2, h);
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_glSubmitHeaderOrVertex(vertex - 2);
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if(is_last_in_strip) {
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_glPerspectiveDivideVertex(vertex - 1, h);
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_glSubmitHeaderOrVertex(vertex - 1);
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_glPerspectiveDivideVertex(vertex, h);
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_glSubmitHeaderOrVertex(vertex);
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tri_count = 0;
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strip_count = 0;
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}
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ShiftRotateTriangle();
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} else if(visible_mask) {
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/* Clipping time!
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There are 6 distinct possibilities when clipping a triangle. 3 of them result
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in another triangle, 3 of them result in a quadrilateral.
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Assuming you iterate the edges of the triangle in order, and create a new *visible*
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vertex when you cross the plane, and discard vertices behind the plane, then the only
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difference between the two cases is that the final two vertices that need submitting have
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to be reversed.
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Unfortunately we have to copy vertices here, because if we persp-divide a vertex it may
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be used in a subsequent triangle in the strip and would end up being double divided.
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*/
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#if CLIP_DEBUG
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printf("Clip: %d, SC: %d\n", visible_mask, strip_count);
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printf("%d, %d, %d\n", triangle[0].v - (Vertex*) src - 1, triangle[1].v - (Vertex*) src - 1, triangle[2].v - (Vertex*) src - 1);
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#endif
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Vertex tmp;
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if(strip_count > 3) {
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#if CLIP_DEBUG
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printf("Flush\n");
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#endif
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tmp = *(vertex - 2);
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/* If we had triangles ahead of this one, submit and finalize */
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_glPerspectiveDivideVertex(&tmp, h);
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_glSubmitHeaderOrVertex(&tmp);
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tmp = *(vertex - 1);
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tmp.flags = GPU_CMD_VERTEX_EOL;
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_glPerspectiveDivideVertex(&tmp, h);
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_glSubmitHeaderOrVertex(&tmp);
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}
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switch(visible_mask) {
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case 1: {
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/* 0, 0a, 2a */
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tmp = *triangle[0].v;
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tmp.flags = GPU_CMD_VERTEX;
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_glPerspectiveDivideVertex(&tmp, h);
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_glSubmitHeaderOrVertex(&tmp);
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_glClipEdge(triangle[0].v, triangle[1].v, &tmp);
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tmp.flags = GPU_CMD_VERTEX;
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_glPerspectiveDivideVertex(&tmp, h);
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_glSubmitHeaderOrVertex(&tmp);
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_glClipEdge(triangle[2].v, triangle[0].v, &tmp);
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tmp.flags = GPU_CMD_VERTEX_EOL;
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_glPerspectiveDivideVertex(&tmp, h);
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_glSubmitHeaderOrVertex(&tmp);
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} break;
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case 2: {
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/* 0a, 1, 1a */
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_glClipEdge(triangle[0].v, triangle[1].v, &tmp);
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tmp.flags = GPU_CMD_VERTEX;
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_glPerspectiveDivideVertex(&tmp, h);
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_glSubmitHeaderOrVertex(&tmp);
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tmp = *triangle[1].v;
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tmp.flags = GPU_CMD_VERTEX;
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_glPerspectiveDivideVertex(&tmp, h);
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_glSubmitHeaderOrVertex(&tmp);
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_glClipEdge(triangle[1].v, triangle[2].v, &tmp);
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tmp.flags = GPU_CMD_VERTEX_EOL;
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_glPerspectiveDivideVertex(&tmp, h);
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_glSubmitHeaderOrVertex(&tmp);
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} break;
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case 3: {
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/* 0, 1, 2a, 1a */
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tmp = *triangle[0].v;
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tmp.flags = GPU_CMD_VERTEX;
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_glPerspectiveDivideVertex(&tmp, h);
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_glSubmitHeaderOrVertex(&tmp);
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tmp = *triangle[1].v;
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tmp.flags = GPU_CMD_VERTEX;
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_glPerspectiveDivideVertex(&tmp, h);
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_glSubmitHeaderOrVertex(&tmp);
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_glClipEdge(triangle[2].v, triangle[0].v, &tmp);
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tmp.flags = GPU_CMD_VERTEX;
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_glPerspectiveDivideVertex(&tmp, h);
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_glSubmitHeaderOrVertex(&tmp);
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_glClipEdge(triangle[1].v, triangle[2].v, &tmp);
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tmp.flags = GPU_CMD_VERTEX_EOL;
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_glPerspectiveDivideVertex(&tmp, h);
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_glSubmitHeaderOrVertex(&tmp);
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} break;
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case 4: {
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/* 1a, 2, 2a */
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_glClipEdge(triangle[1].v, triangle[2].v, &tmp);
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tmp.flags = GPU_CMD_VERTEX;
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_glPerspectiveDivideVertex(&tmp, h);
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_glSubmitHeaderOrVertex(&tmp);
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tmp = *triangle[2].v;
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tmp.flags = GPU_CMD_VERTEX;
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_glPerspectiveDivideVertex(&tmp, h);
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_glSubmitHeaderOrVertex(&tmp);
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_glClipEdge(triangle[2].v, triangle[0].v, &tmp);
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tmp.flags = GPU_CMD_VERTEX_EOL;
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_glPerspectiveDivideVertex(&tmp, h);
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_glSubmitHeaderOrVertex(&tmp);
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} break;
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case 5: {
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/* 0, 0a, 2, 1a */
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tmp = *triangle[0].v;
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tmp.flags = GPU_CMD_VERTEX;
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_glPerspectiveDivideVertex(&tmp, h);
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_glSubmitHeaderOrVertex(&tmp);
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_glClipEdge(triangle[0].v, triangle[1].v, &tmp);
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tmp.flags = GPU_CMD_VERTEX;
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_glPerspectiveDivideVertex(&tmp, h);
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_glSubmitHeaderOrVertex(&tmp);
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tmp = *triangle[2].v;
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tmp.flags = GPU_CMD_VERTEX;
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_glPerspectiveDivideVertex(&tmp, h);
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_glSubmitHeaderOrVertex(&tmp);
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_glClipEdge(triangle[1].v, triangle[2].v, &tmp);
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tmp.flags = GPU_CMD_VERTEX_EOL;
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_glPerspectiveDivideVertex(&tmp, h);
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_glSubmitHeaderOrVertex(&tmp);
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} break;
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case 6: {
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/* 0a, 1, 2a, 2 */
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_glClipEdge(triangle[0].v, triangle[1].v, &tmp);
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tmp.flags = GPU_CMD_VERTEX;
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_glPerspectiveDivideVertex(&tmp, h);
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_glSubmitHeaderOrVertex(&tmp);
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tmp = *triangle[1].v;
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tmp.flags = GPU_CMD_VERTEX;
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_glPerspectiveDivideVertex(&tmp, h);
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_glSubmitHeaderOrVertex(&tmp);
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_glClipEdge(triangle[2].v, triangle[0].v, &tmp);
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tmp.flags = GPU_CMD_VERTEX;
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_glPerspectiveDivideVertex(&tmp, h);
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_glSubmitHeaderOrVertex(&tmp);
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tmp = *triangle[2].v;
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tmp.flags = GPU_CMD_VERTEX_EOL;
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_glPerspectiveDivideVertex(&tmp, h);
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_glSubmitHeaderOrVertex(&tmp);
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} break;
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default:
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break;
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}
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/* If this was the last in the strip, we don't need to
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submit anything else, we just wipe the tri_count */
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if(is_last_in_strip) {
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tri_count = 0;
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strip_count = 0;
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} else {
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ShiftRotateTriangle();
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strip_count = 2;
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}
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} else {
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/* Invisible? Move to the next in the strip */
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if(is_last_in_strip) {
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tri_count = 0;
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strip_count = 0;
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}
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strip_count = 2;
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ShiftRotateTriangle();
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}
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}
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/* Wait for both store queues to complete */
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d = (uint32_t *)0xe0000000;
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d[0] = d[8] = 0;
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}
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void SceneListFinish() {
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pvr_list_finish();
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}
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void SceneFinish() {
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pvr_scene_finish();
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}
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const VideoMode* GetVideoMode() {
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static VideoMode mode;
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mode.width = vid_mode->width;
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mode.height = vid_mode->height;
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return &mode;
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}
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