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Remove divisions

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This commit is contained in:
Luke Benstead 2020-02-22 21:00:33 +00:00
parent 1520226174
commit a3b1ca66c3
1 changed files with 17 additions and 16 deletions
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33
GL/draw.c
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@ -608,19 +608,19 @@ Vertex* _glSubmissionTargetEnd(SubmissionTarget* target) {
}
static inline void genTriangles(Vertex* output, GLuint count) {
const GLuint tris = count / 3;
Vertex* it = output + 2;
ITERATE(tris) {
GLuint i;
for(i = 0; i < count; i += 3) {
it->flags = PVR_CMD_VERTEX_EOL;
it += 3;
}
}
static inline void genQuads(Vertex* output, GLuint count) {
const GLuint quads = count / 4;
Vertex* final = output + 3;
ITERATE(quads) {
GLuint i;
for(i = 0; i < count; i += 4) {
swapVertex((final - 1), final);
final->flags = PVR_CMD_VERTEX_EOL;
final += 4;
@ -807,18 +807,9 @@ static inline void _readNormalData(const GLuint first, const GLuint count, Verte
if(_glIsNormalizeEnabled()) {
GLubyte* ptr = (GLubyte*) extra->nxyz;
GLfloat l;
ITERATE(count) {
GLfloat* n = (GLfloat*) ptr;
vec3f_length(n[0], n[1], n[2], l);
l = 1.0f / l;
n[0] *= l;
n[1] *= l;
n[2] *= l;
vec3f_normalize(n[0], n[1], n[2]);
ptr += sizeof(VertexExtra);
}
}
@ -1140,6 +1131,16 @@ static void light(SubmissionTarget* target) {
_glPerformLighting(vertex, ES, target->count);
}
GL_FORCE_INLINE float MATH_fsrra(float x) {
__asm__ volatile ("fsrra %[one_div_sqrt]\n"
: [one_div_sqrt] "+f" (x) // outputs, "+" means r/w
: // no inputs
: // no clobbers
);
return x;
}
static void divide(SubmissionTarget* target) {
TRACE();
@ -1147,7 +1148,7 @@ static void divide(SubmissionTarget* target) {
Vertex* vertex = _glSubmissionTargetStart(target);
ITERATE(target->count) {
float f = 1.0f / vertex->w;
float f = MATH_fsrra(vertex->w * vertex->w);
vertex->xyz[0] *= f;
vertex->xyz[1] *= f;
vertex->xyz[2] = 1.0 - ((DEPTH_RANGE_MULTIPLIER_L * vertex->xyz[2] * f) + DEPTH_RANGE_MULTIPLIER_H);