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SDL_render.c
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SDL_render.c
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/*
Simple DirectMedia Layer
Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
#include "SDL_internal.h"
/* The SDL 2D rendering system */
#include "SDL_sysrender.h"
#include "software/SDL_render_sw_c.h"
#include "../video/SDL_pixels_c.h"
#include "../video/SDL_video_c.h"
#ifdef __ANDROID__
#include "../core/android/SDL_android.h"
#endif
/* as a courtesy to iOS apps, we don't try to draw when in the background, as
that will crash the app. However, these apps _should_ have used
SDL_AddEventWatch to catch SDL_EVENT_WILL_ENTER_BACKGROUND events and stopped
drawing themselves. Other platforms still draw, as the compositor can use it,
and more importantly: drawing to render targets isn't lost. But I still think
this should probably be removed at some point in the future. --ryan. */
#if defined(__IOS__) || defined(__TVOS__) || defined(__ANDROID__)
#define DONT_DRAW_WHILE_HIDDEN 1
#else
#define DONT_DRAW_WHILE_HIDDEN 0
#endif
#define SDL_WINDOWRENDERDATA "SDL.internal.window.renderer"
#define CHECK_RENDERER_MAGIC(renderer, retval) \
if (!(renderer) || (renderer)->magic != &SDL_renderer_magic) { \
SDL_InvalidParamError("renderer"); \
return retval; \
}
#define CHECK_TEXTURE_MAGIC(texture, retval) \
if (!(texture) || (texture)->magic != &SDL_texture_magic) { \
SDL_InvalidParamError("texture"); \
return retval; \
}
/* Predefined blend modes */
#define SDL_COMPOSE_BLENDMODE(srcColorFactor, dstColorFactor, colorOperation, \
srcAlphaFactor, dstAlphaFactor, alphaOperation) \
(SDL_BlendMode)(((Uint32)(colorOperation) << 0) | \
((Uint32)(srcColorFactor) << 4) | \
((Uint32)(dstColorFactor) << 8) | \
((Uint32)(alphaOperation) << 16) | \
((Uint32)(srcAlphaFactor) << 20) | \
((Uint32)(dstAlphaFactor) << 24))
#define SDL_BLENDMODE_NONE_FULL \
SDL_COMPOSE_BLENDMODE(SDL_BLENDFACTOR_ONE, SDL_BLENDFACTOR_ZERO, SDL_BLENDOPERATION_ADD, \
SDL_BLENDFACTOR_ONE, SDL_BLENDFACTOR_ZERO, SDL_BLENDOPERATION_ADD)
#define SDL_BLENDMODE_BLEND_FULL \
SDL_COMPOSE_BLENDMODE(SDL_BLENDFACTOR_SRC_ALPHA, SDL_BLENDFACTOR_ONE_MINUS_SRC_ALPHA, SDL_BLENDOPERATION_ADD, \
SDL_BLENDFACTOR_ONE, SDL_BLENDFACTOR_ONE_MINUS_SRC_ALPHA, SDL_BLENDOPERATION_ADD)
#define SDL_BLENDMODE_ADD_FULL \
SDL_COMPOSE_BLENDMODE(SDL_BLENDFACTOR_SRC_ALPHA, SDL_BLENDFACTOR_ONE, SDL_BLENDOPERATION_ADD, \
SDL_BLENDFACTOR_ZERO, SDL_BLENDFACTOR_ONE, SDL_BLENDOPERATION_ADD)
#define SDL_BLENDMODE_MOD_FULL \
SDL_COMPOSE_BLENDMODE(SDL_BLENDFACTOR_ZERO, SDL_BLENDFACTOR_SRC_COLOR, SDL_BLENDOPERATION_ADD, \
SDL_BLENDFACTOR_ZERO, SDL_BLENDFACTOR_ONE, SDL_BLENDOPERATION_ADD)
#define SDL_BLENDMODE_MUL_FULL \
SDL_COMPOSE_BLENDMODE(SDL_BLENDFACTOR_DST_COLOR, SDL_BLENDFACTOR_ONE_MINUS_SRC_ALPHA, SDL_BLENDOPERATION_ADD, \
SDL_BLENDFACTOR_ZERO, SDL_BLENDFACTOR_ONE, SDL_BLENDOPERATION_ADD)
#ifndef SDL_RENDER_DISABLED
static const SDL_RenderDriver *render_drivers[] = {
#ifdef SDL_VIDEO_RENDER_D3D12
&D3D12_RenderDriver,
#endif
#ifdef SDL_VIDEO_RENDER_D3D11
&D3D11_RenderDriver,
#endif
#ifdef SDL_VIDEO_RENDER_D3D
&D3D_RenderDriver,
#endif
#ifdef SDL_VIDEO_RENDER_METAL
&METAL_RenderDriver,
#endif
#ifdef SDL_VIDEO_RENDER_OGL
&GL_RenderDriver,
#endif
#ifdef SDL_VIDEO_RENDER_OGL_ES2
&GLES2_RenderDriver,
#endif
#ifdef SDL_VIDEO_RENDER_PS2
&PS2_RenderDriver,
#endif
#ifdef SDL_VIDEO_RENDER_PSP
&PSP_RenderDriver,
#endif
#ifdef SDL_VIDEO_RENDER_VITA_GXM
&VITA_GXM_RenderDriver,
#endif
#if SDL_VIDEO_RENDER_SW
&SW_RenderDriver
#endif
};
#endif /* !SDL_RENDER_DISABLED */
char SDL_renderer_magic;
char SDL_texture_magic;
static SDL_INLINE void DebugLogRenderCommands(const SDL_RenderCommand *cmd)
{
#if 0
unsigned int i = 1;
SDL_Log("Render commands to flush:");
while (cmd) {
switch (cmd->command) {
case SDL_RENDERCMD_NO_OP:
SDL_Log(" %u. no-op", i++);
break;
case SDL_RENDERCMD_SETVIEWPORT:
SDL_Log(" %u. set viewport (first=%u, rect={(%d, %d), %dx%d})", i++,
(unsigned int) cmd->data.viewport.first,
cmd->data.viewport.rect.x, cmd->data.viewport.rect.y,
cmd->data.viewport.rect.w, cmd->data.viewport.rect.h);
break;
case SDL_RENDERCMD_SETCLIPRECT:
SDL_Log(" %u. set cliprect (enabled=%s, rect={(%d, %d), %dx%d})", i++,
cmd->data.cliprect.enabled ? "true" : "false",
cmd->data.cliprect.rect.x, cmd->data.cliprect.rect.y,
cmd->data.cliprect.rect.w, cmd->data.cliprect.rect.h);
break;
case SDL_RENDERCMD_SETDRAWCOLOR:
SDL_Log(" %u. set draw color (first=%u, r=%d, g=%d, b=%d, a=%d)", i++,
(unsigned int) cmd->data.color.first,
(int) cmd->data.color.r, (int) cmd->data.color.g,
(int) cmd->data.color.b, (int) cmd->data.color.a);
break;
case SDL_RENDERCMD_CLEAR:
SDL_Log(" %u. clear (first=%u, r=%d, g=%d, b=%d, a=%d)", i++,
(unsigned int) cmd->data.color.first,
(int) cmd->data.color.r, (int) cmd->data.color.g,
(int) cmd->data.color.b, (int) cmd->data.color.a);
break;
case SDL_RENDERCMD_DRAW_POINTS:
SDL_Log(" %u. draw points (first=%u, count=%u, r=%d, g=%d, b=%d, a=%d, blend=%d)", i++,
(unsigned int) cmd->data.draw.first,
(unsigned int) cmd->data.draw.count,
(int) cmd->data.draw.r, (int) cmd->data.draw.g,
(int) cmd->data.draw.b, (int) cmd->data.draw.a,
(int) cmd->data.draw.blend);
break;
case SDL_RENDERCMD_DRAW_LINES:
SDL_Log(" %u. draw lines (first=%u, count=%u, r=%d, g=%d, b=%d, a=%d, blend=%d)", i++,
(unsigned int) cmd->data.draw.first,
(unsigned int) cmd->data.draw.count,
(int) cmd->data.draw.r, (int) cmd->data.draw.g,
(int) cmd->data.draw.b, (int) cmd->data.draw.a,
(int) cmd->data.draw.blend);
break;
case SDL_RENDERCMD_FILL_RECTS:
SDL_Log(" %u. fill rects (first=%u, count=%u, r=%d, g=%d, b=%d, a=%d, blend=%d)", i++,
(unsigned int) cmd->data.draw.first,
(unsigned int) cmd->data.draw.count,
(int) cmd->data.draw.r, (int) cmd->data.draw.g,
(int) cmd->data.draw.b, (int) cmd->data.draw.a,
(int) cmd->data.draw.blend);
break;
case SDL_RENDERCMD_COPY:
SDL_Log(" %u. copy (first=%u, count=%u, r=%d, g=%d, b=%d, a=%d, blend=%d, tex=%p)", i++,
(unsigned int) cmd->data.draw.first,
(unsigned int) cmd->data.draw.count,
(int) cmd->data.draw.r, (int) cmd->data.draw.g,
(int) cmd->data.draw.b, (int) cmd->data.draw.a,
(int) cmd->data.draw.blend, cmd->data.draw.texture);
break;
case SDL_RENDERCMD_COPY_EX:
SDL_Log(" %u. copyex (first=%u, count=%u, r=%d, g=%d, b=%d, a=%d, blend=%d, tex=%p)", i++,
(unsigned int) cmd->data.draw.first,
(unsigned int) cmd->data.draw.count,
(int) cmd->data.draw.r, (int) cmd->data.draw.g,
(int) cmd->data.draw.b, (int) cmd->data.draw.a,
(int) cmd->data.draw.blend, cmd->data.draw.texture);
break;
case SDL_RENDERCMD_GEOMETRY:
SDL_Log(" %u. geometry (first=%u, count=%u, r=%d, g=%d, b=%d, a=%d, blend=%d, tex=%p)", i++,
(unsigned int) cmd->data.draw.first,
(unsigned int) cmd->data.draw.count,
(int) cmd->data.draw.r, (int) cmd->data.draw.g,
(int) cmd->data.draw.b, (int) cmd->data.draw.a,
(int) cmd->data.draw.blend, cmd->data.draw.texture);
break;
}
cmd = cmd->next;
}
#endif
}
static int FlushRenderCommands(SDL_Renderer *renderer)
{
int retval;
SDL_assert((renderer->render_commands == NULL) == (renderer->render_commands_tail == NULL));
if (!renderer->render_commands) { /* nothing to do! */
SDL_assert(renderer->vertex_data_used == 0);
return 0;
}
DebugLogRenderCommands(renderer->render_commands);
retval = renderer->RunCommandQueue(renderer, renderer->render_commands, renderer->vertex_data, renderer->vertex_data_used);
/* Move the whole render command queue to the unused pool so we can reuse them next time. */
if (renderer->render_commands_tail) {
renderer->render_commands_tail->next = renderer->render_commands_pool;
renderer->render_commands_pool = renderer->render_commands;
renderer->render_commands_tail = NULL;
renderer->render_commands = NULL;
}
renderer->vertex_data_used = 0;
renderer->render_command_generation++;
renderer->color_queued = SDL_FALSE;
renderer->viewport_queued = SDL_FALSE;
renderer->cliprect_queued = SDL_FALSE;
return retval;
}
static int FlushRenderCommandsIfTextureNeeded(SDL_Texture *texture)
{
SDL_Renderer *renderer = texture->renderer;
if (texture->last_command_generation == renderer->render_command_generation) {
/* the current command queue depends on this texture, flush the queue now before it changes */
return FlushRenderCommands(renderer);
}
return 0;
}
int SDL_FlushRenderer(SDL_Renderer *renderer)
{
if (FlushRenderCommands(renderer) == -1) {
return -1;
}
renderer->InvalidateCachedState(renderer);
return 0;
}
void *SDL_AllocateRenderVertices(SDL_Renderer *renderer, const size_t numbytes, const size_t alignment, size_t *offset)
{
const size_t needed = renderer->vertex_data_used + numbytes + alignment;
const size_t current_offset = renderer->vertex_data_used;
const size_t aligner = (alignment && ((current_offset & (alignment - 1)) != 0)) ? (alignment - (current_offset & (alignment - 1))) : 0;
const size_t aligned = current_offset + aligner;
if (renderer->vertex_data_allocation < needed) {
const size_t current_allocation = renderer->vertex_data ? renderer->vertex_data_allocation : 1024;
size_t newsize = current_allocation * 2;
void *ptr;
while (newsize < needed) {
newsize *= 2;
}
ptr = SDL_realloc(renderer->vertex_data, newsize);
if (!ptr) {
SDL_OutOfMemory();
return NULL;
}
renderer->vertex_data = ptr;
renderer->vertex_data_allocation = newsize;
}
if (offset) {
*offset = aligned;
}
renderer->vertex_data_used += aligner + numbytes;
return ((Uint8 *)renderer->vertex_data) + aligned;
}
static SDL_RenderCommand *AllocateRenderCommand(SDL_Renderer *renderer)
{
SDL_RenderCommand *retval = NULL;
/* !!! FIXME: are there threading limitations in SDL's render API? If not, we need to mutex this. */
retval = renderer->render_commands_pool;
if (retval) {
renderer->render_commands_pool = retval->next;
retval->next = NULL;
} else {
retval = SDL_calloc(1, sizeof(*retval));
if (!retval) {
SDL_OutOfMemory();
return NULL;
}
}
SDL_assert((renderer->render_commands == NULL) == (renderer->render_commands_tail == NULL));
if (renderer->render_commands_tail) {
renderer->render_commands_tail->next = retval;
} else {
renderer->render_commands = retval;
}
renderer->render_commands_tail = retval;
return retval;
}
static void GetRenderViewportInPixels(SDL_Renderer *renderer, SDL_Rect *rect)
{
rect->x = (int)SDL_floorf(renderer->view->viewport.x * renderer->view->scale.x);
rect->y = (int)SDL_floorf(renderer->view->viewport.y * renderer->view->scale.y);
if (renderer->view->viewport.w >= 0) {
rect->w = (int)SDL_floorf(renderer->view->viewport.w * renderer->view->scale.x);
} else {
rect->w = renderer->view->pixel_w;
}
if (renderer->view->viewport.h >= 0) {
rect->h = (int)SDL_floorf(renderer->view->viewport.h * renderer->view->scale.y);
} else {
rect->h = renderer->view->pixel_h;
}
}
static int QueueCmdSetViewport(SDL_Renderer *renderer)
{
SDL_Rect viewport;
int retval = 0;
GetRenderViewportInPixels(renderer, &viewport);
if (!renderer->viewport_queued ||
SDL_memcmp(&viewport, &renderer->last_queued_viewport, sizeof(viewport)) != 0) {
SDL_RenderCommand *cmd = AllocateRenderCommand(renderer);
if (cmd) {
cmd->command = SDL_RENDERCMD_SETVIEWPORT;
cmd->data.viewport.first = 0; /* render backend will fill this in. */
SDL_copyp(&cmd->data.viewport.rect, &viewport);
retval = renderer->QueueSetViewport(renderer, cmd);
if (retval < 0) {
cmd->command = SDL_RENDERCMD_NO_OP;
} else {
SDL_copyp(&renderer->last_queued_viewport, &viewport);
renderer->viewport_queued = SDL_TRUE;
}
} else {
retval = -1;
}
}
return retval;
}
static int QueueCmdSetClipRect(SDL_Renderer *renderer)
{
SDL_Rect clip_rect;
int retval = 0;
clip_rect.x = (int)SDL_floorf(renderer->view->clip_rect.x * renderer->view->scale.x);
clip_rect.y = (int)SDL_floorf(renderer->view->clip_rect.y * renderer->view->scale.y);
clip_rect.w = (int)SDL_floorf(renderer->view->clip_rect.w * renderer->view->scale.x);
clip_rect.h = (int)SDL_floorf(renderer->view->clip_rect.h * renderer->view->scale.y);
if (!renderer->cliprect_queued ||
renderer->view->clipping_enabled != renderer->last_queued_cliprect_enabled ||
SDL_memcmp(&clip_rect, &renderer->last_queued_cliprect, sizeof(clip_rect)) != 0) {
SDL_RenderCommand *cmd = AllocateRenderCommand(renderer);
if (cmd) {
cmd->command = SDL_RENDERCMD_SETCLIPRECT;
cmd->data.cliprect.enabled = renderer->view->clipping_enabled;
SDL_copyp(&cmd->data.cliprect.rect, &clip_rect);
SDL_copyp(&renderer->last_queued_cliprect, &clip_rect);
renderer->last_queued_cliprect_enabled = renderer->view->clipping_enabled;
renderer->cliprect_queued = SDL_TRUE;
} else {
retval = -1;
}
}
return retval;
}
static int QueueCmdSetDrawColor(SDL_Renderer *renderer, SDL_Color *col)
{
const Uint32 color = (((Uint32)col->a << 24) | (col->r << 16) | (col->g << 8) | col->b);
int retval = 0;
if (!renderer->color_queued || (color != renderer->last_queued_color)) {
SDL_RenderCommand *cmd = AllocateRenderCommand(renderer);
retval = -1;
if (cmd) {
cmd->command = SDL_RENDERCMD_SETDRAWCOLOR;
cmd->data.color.first = 0; /* render backend will fill this in. */
cmd->data.color.r = col->r;
cmd->data.color.g = col->g;
cmd->data.color.b = col->b;
cmd->data.color.a = col->a;
retval = renderer->QueueSetDrawColor(renderer, cmd);
if (retval < 0) {
cmd->command = SDL_RENDERCMD_NO_OP;
} else {
renderer->last_queued_color = color;
renderer->color_queued = SDL_TRUE;
}
}
}
return retval;
}
static int QueueCmdClear(SDL_Renderer *renderer)
{
SDL_RenderCommand *cmd = AllocateRenderCommand(renderer);
if (!cmd) {
return -1;
}
cmd->command = SDL_RENDERCMD_CLEAR;
cmd->data.color.first = 0;
cmd->data.color.r = renderer->color.r;
cmd->data.color.g = renderer->color.g;
cmd->data.color.b = renderer->color.b;
cmd->data.color.a = renderer->color.a;
return 0;
}
static SDL_RenderCommand *PrepQueueCmdDraw(SDL_Renderer *renderer, const SDL_RenderCommandType cmdtype, SDL_Texture *texture)
{
SDL_RenderCommand *cmd = NULL;
int retval = 0;
SDL_Color *color;
SDL_BlendMode blendMode;
if (texture) {
color = &texture->color;
blendMode = texture->blendMode;
} else {
color = &renderer->color;
blendMode = renderer->blendMode;
}
if (cmdtype != SDL_RENDERCMD_GEOMETRY) {
retval = QueueCmdSetDrawColor(renderer, color);
}
/* Set the viewport and clip rect directly before draws, so the backends
* don't have to worry about that state not being valid at draw time. */
if (retval == 0 && !renderer->viewport_queued) {
retval = QueueCmdSetViewport(renderer);
}
if (retval == 0 && !renderer->cliprect_queued) {
retval = QueueCmdSetClipRect(renderer);
}
if (retval == 0) {
cmd = AllocateRenderCommand(renderer);
if (cmd) {
cmd->command = cmdtype;
cmd->data.draw.first = 0; /* render backend will fill this in. */
cmd->data.draw.count = 0; /* render backend will fill this in. */
cmd->data.draw.r = color->r;
cmd->data.draw.g = color->g;
cmd->data.draw.b = color->b;
cmd->data.draw.a = color->a;
cmd->data.draw.blend = blendMode;
cmd->data.draw.texture = texture;
}
}
return cmd;
}
static int QueueCmdDrawPoints(SDL_Renderer *renderer, const SDL_FPoint *points, const int count)
{
SDL_RenderCommand *cmd = PrepQueueCmdDraw(renderer, SDL_RENDERCMD_DRAW_POINTS, NULL);
int retval = -1;
if (cmd) {
retval = renderer->QueueDrawPoints(renderer, cmd, points, count);
if (retval < 0) {
cmd->command = SDL_RENDERCMD_NO_OP;
}
}
return retval;
}
static int QueueCmdDrawLines(SDL_Renderer *renderer, const SDL_FPoint *points, const int count)
{
SDL_RenderCommand *cmd = PrepQueueCmdDraw(renderer, SDL_RENDERCMD_DRAW_LINES, NULL);
int retval = -1;
if (cmd) {
retval = renderer->QueueDrawLines(renderer, cmd, points, count);
if (retval < 0) {
cmd->command = SDL_RENDERCMD_NO_OP;
}
}
return retval;
}
static int QueueCmdFillRects(SDL_Renderer *renderer, const SDL_FRect *rects, const int count)
{
SDL_RenderCommand *cmd;
int retval = -1;
const int use_rendergeometry = (!renderer->QueueFillRects);
cmd = PrepQueueCmdDraw(renderer, (use_rendergeometry ? SDL_RENDERCMD_GEOMETRY : SDL_RENDERCMD_FILL_RECTS), NULL);
if (cmd) {
if (use_rendergeometry) {
SDL_bool isstack1;
SDL_bool isstack2;
float *xy = SDL_small_alloc(float, 4 * 2 * count, &isstack1);
int *indices = SDL_small_alloc(int, 6 * count, &isstack2);
if (xy && indices) {
int i;
float *ptr_xy = xy;
int *ptr_indices = indices;
const int xy_stride = 2 * sizeof(float);
const int num_vertices = 4 * count;
const int num_indices = 6 * count;
const int size_indices = 4;
int cur_index = 0;
const int *rect_index_order = renderer->rect_index_order;
for (i = 0; i < count; ++i) {
float minx, miny, maxx, maxy;
minx = rects[i].x;
miny = rects[i].y;
maxx = rects[i].x + rects[i].w;
maxy = rects[i].y + rects[i].h;
*ptr_xy++ = minx;
*ptr_xy++ = miny;
*ptr_xy++ = maxx;
*ptr_xy++ = miny;
*ptr_xy++ = maxx;
*ptr_xy++ = maxy;
*ptr_xy++ = minx;
*ptr_xy++ = maxy;
*ptr_indices++ = cur_index + rect_index_order[0];
*ptr_indices++ = cur_index + rect_index_order[1];
*ptr_indices++ = cur_index + rect_index_order[2];
*ptr_indices++ = cur_index + rect_index_order[3];
*ptr_indices++ = cur_index + rect_index_order[4];
*ptr_indices++ = cur_index + rect_index_order[5];
cur_index += 4;
}
retval = renderer->QueueGeometry(renderer, cmd, NULL,
xy, xy_stride, &renderer->color, 0 /* color_stride */, NULL, 0,
num_vertices, indices, num_indices, size_indices,
1.0f, 1.0f);
if (retval < 0) {
cmd->command = SDL_RENDERCMD_NO_OP;
}
}
SDL_small_free(xy, isstack1);
SDL_small_free(indices, isstack2);
} else {
retval = renderer->QueueFillRects(renderer, cmd, rects, count);
if (retval < 0) {
cmd->command = SDL_RENDERCMD_NO_OP;
}
}
}
return retval;
}
static int QueueCmdCopy(SDL_Renderer *renderer, SDL_Texture *texture, const SDL_FRect *srcrect, const SDL_FRect *dstrect)
{
SDL_RenderCommand *cmd = PrepQueueCmdDraw(renderer, SDL_RENDERCMD_COPY, texture);
int retval = -1;
if (cmd) {
retval = renderer->QueueCopy(renderer, cmd, texture, srcrect, dstrect);
if (retval < 0) {
cmd->command = SDL_RENDERCMD_NO_OP;
}
}
return retval;
}
static int QueueCmdCopyEx(SDL_Renderer *renderer, SDL_Texture *texture,
const SDL_FRect *srcquad, const SDL_FRect *dstrect,
const double angle, const SDL_FPoint *center, const SDL_RendererFlip flip, float scale_x, float scale_y)
{
SDL_RenderCommand *cmd = PrepQueueCmdDraw(renderer, SDL_RENDERCMD_COPY_EX, texture);
int retval = -1;
if (cmd) {
retval = renderer->QueueCopyEx(renderer, cmd, texture, srcquad, dstrect, angle, center, flip, scale_x, scale_y);
if (retval < 0) {
cmd->command = SDL_RENDERCMD_NO_OP;
}
}
return retval;
}
static int QueueCmdGeometry(SDL_Renderer *renderer, SDL_Texture *texture,
const float *xy, int xy_stride,
const SDL_Color *color, int color_stride,
const float *uv, int uv_stride,
int num_vertices,
const void *indices, int num_indices, int size_indices,
float scale_x, float scale_y)
{
SDL_RenderCommand *cmd;
int retval = -1;
cmd = PrepQueueCmdDraw(renderer, SDL_RENDERCMD_GEOMETRY, texture);
if (cmd) {
retval = renderer->QueueGeometry(renderer, cmd, texture,
xy, xy_stride,
color, color_stride, uv, uv_stride,
num_vertices, indices, num_indices, size_indices,
scale_x, scale_y);
if (retval < 0) {
cmd->command = SDL_RENDERCMD_NO_OP;
}
}
return retval;
}
static void UpdateMainViewDimensions(SDL_Renderer *renderer)
{
int window_w = 0, window_h = 0;
if (renderer->window) {
SDL_GetWindowSize(renderer->window, &window_w, &window_h);
}
SDL_GetRenderOutputSize(renderer, &renderer->main_view.pixel_w, &renderer->main_view.pixel_h);
if (window_w > 0 && window_h > 0) {
renderer->dpi_scale.x = (float)renderer->main_view.pixel_w / window_w;
renderer->dpi_scale.y = (float)renderer->main_view.pixel_h / window_h;
} else {
renderer->dpi_scale.x = 1.0f;
renderer->dpi_scale.y = 1.0f;
}
}
static int UpdateLogicalPresentation(SDL_Renderer *renderer);
int SDL_GetNumRenderDrivers(void)
{
#ifndef SDL_RENDER_DISABLED
return SDL_arraysize(render_drivers);
#else
return 0;
#endif
}
const char *SDL_GetRenderDriver(int index)
{
#ifndef SDL_RENDER_DISABLED
if (index < 0 || index >= SDL_GetNumRenderDrivers()) {
SDL_SetError("index must be in the range of 0 - %d",
SDL_GetNumRenderDrivers() - 1);
return NULL;
}
return render_drivers[index]->info.name;
#else
SDL_SetError("SDL not built with rendering support");
return NULL;
#endif
}
static int SDLCALL SDL_RendererEventWatch(void *userdata, SDL_Event *event)
{
SDL_Renderer *renderer = (SDL_Renderer *)userdata;
if (event->type >= SDL_EVENT_WINDOW_FIRST && event->type <= SDL_EVENT_WINDOW_LAST) {
SDL_Window *window = SDL_GetWindowFromID(event->window.windowID);
if (window == renderer->window) {
if (renderer->WindowEvent) {
renderer->WindowEvent(renderer, &event->window);
}
if (event->type == SDL_EVENT_WINDOW_RESIZED ||
event->type == SDL_EVENT_WINDOW_PIXEL_SIZE_CHANGED) {
UpdateMainViewDimensions(renderer);
UpdateLogicalPresentation(renderer);
} else if (event->type == SDL_EVENT_WINDOW_HIDDEN) {
renderer->hidden = SDL_TRUE;
} else if (event->type == SDL_EVENT_WINDOW_SHOWN) {
if (!(SDL_GetWindowFlags(window) & SDL_WINDOW_MINIMIZED)) {
renderer->hidden = SDL_FALSE;
}
} else if (event->type == SDL_EVENT_WINDOW_MINIMIZED) {
renderer->hidden = SDL_TRUE;
} else if (event->type == SDL_EVENT_WINDOW_RESTORED ||
event->type == SDL_EVENT_WINDOW_MAXIMIZED) {
if (!(SDL_GetWindowFlags(window) & SDL_WINDOW_HIDDEN)) {
renderer->hidden = SDL_FALSE;
}
}
}
}
return 0;
}
int SDL_CreateWindowAndRenderer(int width, int height, Uint32 window_flags, SDL_Window **window, SDL_Renderer **renderer)
{
*window = SDL_CreateWindow(NULL, width, height, window_flags);
if (!*window) {
*renderer = NULL;
return -1;
}
*renderer = SDL_CreateRenderer(*window, NULL, 0);
if (!*renderer) {
return -1;
}
return 0;
}
#ifndef SDL_RENDER_DISABLED
static SDL_INLINE void VerifyDrawQueueFunctions(const SDL_Renderer *renderer)
{
/* all of these functions are required to be implemented, even as no-ops, so we don't
have to check that they aren't NULL over and over. */
SDL_assert(renderer->QueueSetViewport != NULL);
SDL_assert(renderer->QueueSetDrawColor != NULL);
SDL_assert(renderer->QueueDrawPoints != NULL);
SDL_assert(renderer->QueueDrawLines != NULL || renderer->QueueGeometry != NULL);
SDL_assert(renderer->QueueFillRects != NULL || renderer->QueueGeometry != NULL);
SDL_assert(renderer->QueueCopy != NULL || renderer->QueueGeometry != NULL);
SDL_assert(renderer->RunCommandQueue != NULL);
}
static SDL_RenderLineMethod SDL_GetRenderLineMethod(void)
{
const char *hint = SDL_GetHint(SDL_HINT_RENDER_LINE_METHOD);
int method = 0;
if (hint) {
method = SDL_atoi(hint);
}
switch (method) {
case 1:
return SDL_RENDERLINEMETHOD_POINTS;
case 2:
return SDL_RENDERLINEMETHOD_LINES;
case 3:
return SDL_RENDERLINEMETHOD_GEOMETRY;
default:
return SDL_RENDERLINEMETHOD_POINTS;
}
}
static void SDL_CalculateSimulatedVSyncInterval(SDL_Renderer *renderer, SDL_Window *window)
{
SDL_DisplayID displayID = SDL_GetDisplayForWindow(window);
const SDL_DisplayMode *mode;
float refresh_rate;
int num, den;
if (displayID == 0) {
displayID = SDL_GetPrimaryDisplay();
}
mode = SDL_GetDesktopDisplayMode(displayID);
if (mode && mode->refresh_rate > 0.0f) {
refresh_rate = mode->refresh_rate;
} else {
/* Pick a good default refresh rate */
refresh_rate = 60.0f;
}
num = 100;
den = (int)(100 * refresh_rate);
renderer->simulate_vsync_interval_ns = (SDL_NS_PER_SECOND * num) / den;
}
#endif /* !SDL_RENDER_DISABLED */
SDL_Renderer *SDL_CreateRendererWithProperties(SDL_PropertiesID props)
{
#ifndef SDL_RENDER_DISABLED
SDL_Window *window = SDL_GetProperty(props, "window", NULL);
SDL_Surface *surface = SDL_GetProperty(props, "surface", NULL);
const char *name = SDL_GetStringProperty(props, "name", NULL);
SDL_Renderer *renderer = NULL;
const int n = SDL_GetNumRenderDrivers();
const char *hint;
int i;
if (!window && surface) {
return SDL_CreateSoftwareRenderer(surface);
}
#ifdef __ANDROID__
Android_ActivityMutex_Lock_Running();
#endif
if (!window) {
SDL_InvalidParamError("window");
goto error;
}
if (SDL_HasWindowSurface(window)) {
SDL_SetError("Surface already associated with window");
goto error;
}
if (SDL_GetRenderer(window)) {
SDL_SetError("Renderer already associated with window");
goto error;
}
hint = SDL_GetHint(SDL_HINT_RENDER_VSYNC);
if (hint && *hint) {
SDL_SetBooleanProperty(props, "present_vsync", SDL_GetHintBoolean(SDL_HINT_RENDER_VSYNC, SDL_TRUE));
}
if (!name) {
name = SDL_GetHint(SDL_HINT_RENDER_DRIVER);
}
if (name) {
for (i = 0; i < n; i++) {
const SDL_RenderDriver *driver = render_drivers[i];
if (SDL_strcasecmp(name, driver->info.name) == 0) {
/* Create a new renderer instance */
renderer = driver->CreateRenderer(window, props);
break;
}
}
} else {
for (i = 0; i < n; i++) {
const SDL_RenderDriver *driver = render_drivers[i];
/* Create a new renderer instance */
renderer = driver->CreateRenderer(window, props);
if (renderer) {
/* Yay, we got one! */
break;
}
}
}
if (!renderer) {
SDL_SetError("Couldn't find matching render driver");
goto error;
}
if (SDL_GetBooleanProperty(props, "present_vsync", SDL_FALSE)) {
renderer->wanted_vsync = SDL_TRUE;
if (!(renderer->info.flags & SDL_RENDERER_PRESENTVSYNC)) {
renderer->simulate_vsync = SDL_TRUE;
renderer->info.flags |= SDL_RENDERER_PRESENTVSYNC;
}
}
SDL_CalculateSimulatedVSyncInterval(renderer, window);
VerifyDrawQueueFunctions(renderer);
renderer->magic = &SDL_renderer_magic;
renderer->window = window;
renderer->target_mutex = SDL_CreateMutex();
renderer->main_view.viewport.w = -1;
renderer->main_view.viewport.h = -1;
renderer->main_view.scale.x = 1.0f;
renderer->main_view.scale.y = 1.0f;
renderer->view = &renderer->main_view;
renderer->dpi_scale.x = 1.0f;
renderer->dpi_scale.y = 1.0f;
UpdateMainViewDimensions(renderer);
/* Default value, if not specified by the renderer back-end */
if (renderer->rect_index_order[0] == 0 && renderer->rect_index_order[1] == 0) {
renderer->rect_index_order[0] = 0;
renderer->rect_index_order[1] = 1;
renderer->rect_index_order[2] = 2;
renderer->rect_index_order[3] = 0;
renderer->rect_index_order[4] = 2;
renderer->rect_index_order[5] = 3;
}
/* new textures start at zero, so we start at 1 so first render doesn't flush by accident. */
renderer->render_command_generation = 1;
renderer->line_method = SDL_GetRenderLineMethod();
if (SDL_GetWindowFlags(window) & (SDL_WINDOW_HIDDEN | SDL_WINDOW_MINIMIZED)) {
renderer->hidden = SDL_TRUE;
} else {
renderer->hidden = SDL_FALSE;
}
SDL_SetProperty(SDL_GetWindowProperties(window), SDL_WINDOWRENDERDATA, renderer);
SDL_SetRenderViewport(renderer, NULL);
SDL_AddEventWatch(SDL_RendererEventWatch, renderer);
SDL_LogInfo(SDL_LOG_CATEGORY_RENDER,
"Created renderer: %s", renderer->info.name);
#ifdef __ANDROID__
Android_ActivityMutex_Unlock();
#endif
return renderer;
error:
#ifdef __ANDROID__
Android_ActivityMutex_Unlock();
#endif
return NULL;
#else
SDL_SetError("SDL not built with rendering support");
return NULL;
#endif
}
SDL_Renderer *SDL_CreateRenderer(SDL_Window *window, const char *name, Uint32 flags)
{
SDL_Renderer *renderer;
SDL_PropertiesID props = SDL_CreateProperties();
SDL_SetProperty(props, "window", window);
if (flags & SDL_RENDERER_SOFTWARE) {
SDL_SetStringProperty(props, "name", "software");
} else {
SDL_SetStringProperty(props, "name", name);
}
if (flags & SDL_RENDERER_PRESENTVSYNC) {
SDL_SetBooleanProperty(props, "present_vsync", SDL_TRUE);
}
renderer = SDL_CreateRendererWithProperties(props);
SDL_DestroyProperties(props);
return renderer;
}
SDL_Renderer *SDL_CreateSoftwareRenderer(SDL_Surface *surface)
{
#if !defined(SDL_RENDER_DISABLED) && SDL_VIDEO_RENDER_SW
SDL_Renderer *renderer;
renderer = SW_CreateRendererForSurface(surface);
if (renderer) {
VerifyDrawQueueFunctions(renderer);
renderer->magic = &SDL_renderer_magic;
renderer->target_mutex = SDL_CreateMutex();
renderer->main_view.pixel_w = surface->w;
renderer->main_view.pixel_h = surface->h;
renderer->main_view.viewport.w = -1;
renderer->main_view.viewport.h = -1;
renderer->main_view.scale.x = 1.0f;
renderer->main_view.scale.y = 1.0f;
renderer->view = &renderer->main_view;
renderer->dpi_scale.x = 1.0f;
renderer->dpi_scale.y = 1.0f;
/* new textures start at zero, so we start at 1 so first render doesn't flush by accident. */
renderer->render_command_generation = 1;
/* Software renderer always uses line method, for speed */
renderer->line_method = SDL_RENDERLINEMETHOD_LINES;
SDL_SetRenderViewport(renderer, NULL);
}
return renderer;
#else
SDL_SetError("SDL not built with rendering support");
return NULL;
#endif /* !SDL_RENDER_DISABLED */
}