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Add software renderer implementation

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Sylvain 2021-03-16 15:14:58 +01:00 • committed by Sylvain Becker
parent 37f78fc1cc
commit 3ee511d71c
3 changed files with 969 additions and 0 deletions
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100
src/render/software/SDL_render_sw.c
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@ -33,6 +33,7 @@
#include "SDL_drawline.h"
#include "SDL_drawpoint.h"
#include "SDL_rotate.h"
#include "SDL_triangle.h"
/* SDL surface based renderer implementation */
@ -560,6 +561,71 @@ SW_RenderCopyEx(SDL_Renderer * renderer, SDL_Surface *surface, SDL_Texture * tex
return retval;
}
typedef struct GeometryFillData
{
SDL_Point dst;
SDL_Color color;
} GeometryFillData;
typedef struct GeometryCopyData
{
SDL_Point src;
SDL_Point dst;
SDL_Color color;
} GeometryCopyData;
static int
SW_QueueGeometry(SDL_Renderer *renderer, SDL_RenderCommand *cmd, SDL_Texture *texture,
SDL_Vertex *vertices, int num_vertices, int *indices, int num_indices, float scale_x, float scale_y)
{
int i;
int count = indices ? num_indices : num_vertices;
void *verts;
int sz = texture ? sizeof (GeometryCopyData) : sizeof (GeometryFillData);
verts = (void *) SDL_AllocateRenderVertices(renderer, count * sz, 0, &cmd->data.draw.first);
if (!verts) {
return -1;
}
cmd->data.draw.count = count;
if (texture) {
GeometryCopyData *ptr = (GeometryCopyData *) verts;
for (i = 0; i < count; i++) {
SDL_Vertex *v = &vertices[indices ? indices[i] : i];
ptr->src.x = v->tex_coord.x;
ptr->src.y = v->tex_coord.y;
ptr->dst.x = v->position.x * scale_x + renderer->viewport.x;
ptr->dst.y = v->position.y * scale_y + renderer->viewport.y;
trianglepoint_2_fixedpoint(&ptr->dst);
ptr->color = v->color;
ptr++;
}
} else {
GeometryFillData *ptr = (GeometryFillData *) verts;
for (i = 0; i < count; i++) {
SDL_Vertex *v = &vertices[indices ? indices[i] : i];
ptr->dst.x = v->position.x * scale_x + renderer->viewport.x;
ptr->dst.y = v->position.y * scale_y + renderer->viewport.y;
trianglepoint_2_fixedpoint(&ptr->dst);
ptr->color = v->color;
ptr++;
}
}
return 0;
}
static void
PrepTextureForCopy(const SDL_RenderCommand *cmd)
{
@ -734,6 +800,39 @@ SW_RunCommandQueue(SDL_Renderer * renderer, SDL_RenderCommand *cmd, void *vertic
break;
}
case SDL_RENDERCMD_GEOMETRY: {
int i;
SDL_Rect *verts = (SDL_Rect *) (((Uint8 *) vertices) + cmd->data.draw.first);
const int count = (int) cmd->data.draw.count;
SDL_Texture *texture = cmd->data.draw.texture;
const SDL_BlendMode blend = cmd->data.draw.blend;
SetDrawState(surface, &drawstate);
if (texture) {
SDL_Surface *src = (SDL_Surface *) texture->driverdata;
GeometryCopyData *ptr = (GeometryCopyData *) verts;
PrepTextureForCopy(cmd);
for (i = 0; i < count; i += 3, ptr += 3) {
SDL_SW_BlitTriangle(
src,
&(ptr[0].src), &(ptr[1].src), &(ptr[2].src),
surface,
&(ptr[0].dst), &(ptr[1].dst), &(ptr[2].dst),
ptr[0].color, ptr[1].color, ptr[2].color);
}
} else {
GeometryFillData *ptr = (GeometryFillData *) verts;
for (i = 0; i < count; i += 3, ptr += 3) {
SDL_SW_FillTriangle(surface, &(ptr[0].dst), &(ptr[1].dst), &(ptr[2].dst), blend, ptr[0].color, ptr[1].color, ptr[2].color);
}
}
break;
}
case SDL_RENDERCMD_NO_OP:
break;
}
@ -843,6 +942,7 @@ SW_CreateRendererForSurface(SDL_Surface * surface)
renderer->QueueFillRects = SW_QueueFillRects;
renderer->QueueCopy = SW_QueueCopy;
renderer->QueueCopyEx = SW_QueueCopyEx;
renderer->QueueGeometry = SW_QueueGeometry;
renderer->RunCommandQueue = SW_RunCommandQueue;
renderer->RenderReadPixels = SW_RenderReadPixels;
renderer->RenderPresent = SW_RenderPresent;