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Make OpenGL 3.3 renderer use only one memcpy

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This commit is contained in:
ts-korhonen 2021-09-14 08:56:26 +03:00
parent a68b738308
commit bce7c07880
1 changed files with 6 additions and 13 deletions
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19
src/win/win_opengl.c
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@ -64,6 +64,7 @@ static const int INIT_HEIGHT = 400;
static const int BUFFERPIXELS = 4460544; /* Same size as render_buffer, pow(2048+64,2). */
static const int BUFFERBYTES = 17842176; /* Pixel is 4 bytes. */
static const int BUFFERCOUNT = 3; /* How many buffers to use for pixel transfer (2-3 is commonly recommended). */
static const int ROW_LENGTH = 2112; /* Source buffer row lenght (including padding) */
/**
* @brief A dedicated OpenGL thread.
@ -106,7 +107,7 @@ static union
*/
typedef struct
{
int y1, y2, w, h;
int w, h;
void* buffer; /* Buffer for pixel transfer, allocated by gpu driver. */
volatile atomic_flag in_use; /* Is buffer currently in use. */
GLsync sync; /* Fence sync object used by opengl thread to track pixel transfer completion. */
@ -641,18 +642,16 @@ static void opengl_main(void* param)
SetEvent(sync_objects.resize);
}
/* Clip to height. y2 can be out-of-bounds. */
int sub_height = MIN(info->y2, info->h) - info->y1;
if (!GLAD_GL_ARB_buffer_storage)
{
/* Fallback method, copy data to pixel buffer. */
glBufferSubData(GL_PIXEL_UNPACK_BUFFER, BUFFERBYTES * read_pos, info->w * sub_height * sizeof(uint32_t), info->buffer);
glBufferSubData(GL_PIXEL_UNPACK_BUFFER, BUFFERBYTES * read_pos, info->h * ROW_LENGTH * sizeof(uint32_t), info->buffer);
}
/* Update texture from pixel buffer. */
glPixelStorei(GL_UNPACK_SKIP_PIXELS, BUFFERPIXELS * read_pos);
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, info->y1, info->w, sub_height, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, NULL);
glPixelStorei(GL_UNPACK_ROW_LENGTH, ROW_LENGTH);
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, info->w, info->h, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, NULL);
/* Add fence to track when above gl commands are complete. */
info->sync = glFenceSync(GL_SYNC_GPU_COMMANDS_COMPLETE, 0);
@ -819,16 +818,10 @@ static void opengl_blit(int x, int y, int w, int h)
return;
}
for (yy = 0; yy < h; yy++) {
if ((y + yy) >= 0 && (y + yy) < buffer32->h)
memcpy(blit_info[write_pos].buffer + (yy * w * sizeof(uint32_t)),
&(((uint32_t *) buffer32->line[y + yy])[x]), w * sizeof(uint32_t));
}
memcpy(blit_info[write_pos].buffer, &(buffer32->line[y][x]), h * ROW_LENGTH * sizeof(uint32_t));
video_blit_complete();
blit_info[write_pos].y1 = 0;
blit_info[write_pos].y2 = h - 1;
blit_info[write_pos].w = w;
blit_info[write_pos].h = h;