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Fix text-flickering in the OpenGL renderers

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This would occur in CSE2E's options menu.

It was caused by cute_spritebatch destroying a texture atlas that
was being used by the current unflushed vertex buffer. To solve
this, we now track what textures are being used by current buffer,
and flush the buffer when the texture are about to be
modified/deleted.

As you can guess, this issue doesn't affect the SDLTexture backend,
since its batching system is half-decent.
This commit is contained in:
Clownacy 2020-02-03 15:44:09 +00:00
parent b894543f3b
commit dfacd62662
1 changed files with 28 additions and 15 deletions
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43
src/Backends/Rendering/OpenGL3.cpp
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@ -92,6 +92,8 @@ static unsigned long local_vertex_buffer_size;
static unsigned long current_vertex_buffer_slot;
static RenderMode last_render_mode;
static GLuint last_source_texture;
static GLuint last_destination_texture;
static Backend_Surface framebuffer;
@ -375,8 +377,6 @@ static void FlushVertexBuffer(void)
// Blit the glyphs in the batch
static void GlyphBatch_Draw(spritebatch_sprite_t *sprites, int count, int texture_w, int texture_h, void *udata)
{
static Backend_Surface *last_surface;
static GLuint last_texture_id;
static unsigned char last_red;
static unsigned char last_green;
static unsigned char last_blue;
@ -389,13 +389,13 @@ static void GlyphBatch_Draw(spritebatch_sprite_t *sprites, int count, int textur
GLuint texture_id = (GLuint)sprites[0].texture_id;
// Flush vertex data if a context-change is needed
if (last_render_mode != MODE_DRAW_GLYPH || last_surface != glyph_destination_surface || last_texture_id != texture_id || last_red != glyph_colour_channels[0] || last_green != glyph_colour_channels[1] || last_blue != glyph_colour_channels[2])
if (last_render_mode != MODE_DRAW_GLYPH || last_destination_texture != glyph_destination_surface->texture_id || last_source_texture != texture_id || last_red != glyph_colour_channels[0] || last_green != glyph_colour_channels[1] || last_blue != glyph_colour_channels[2])
{
FlushVertexBuffer();
last_render_mode = MODE_DRAW_GLYPH;
last_surface = glyph_destination_surface;
last_texture_id = texture_id;
last_destination_texture = glyph_destination_surface->texture_id;
last_source_texture = texture_id;
last_red = glyph_colour_channels[0];
last_green = glyph_colour_channels[1];
last_blue = glyph_colour_channels[2];
@ -509,7 +509,13 @@ static void GlyphBatch_DestroyTexture(SPRITEBATCH_U64 texture_id, void *udata)
{
(void)udata;
glDeleteTextures(1, (GLuint*)&texture_id);
GLuint gl_texture_id = (GLuint)texture_id;
// Flush the vertex buffer if we're about to destroy its texture
if (gl_texture_id == last_source_texture || gl_texture_id == last_destination_texture)
FlushVertexBuffer();
glDeleteTextures(1, &gl_texture_id);
}
// ====================
@ -719,6 +725,8 @@ void Backend_DrawScreen(void)
{
FlushVertexBuffer();
last_render_mode = MODE_BLANK;
last_source_texture = 0;
last_destination_texture = 0;
glUseProgram(program_texture);
@ -819,6 +827,10 @@ void Backend_FreeSurface(Backend_Surface *surface)
if (surface == NULL)
return;
// Flush the vertex buffer if we're about to destroy its texture
if (surface->texture_id == last_source_texture || surface->texture_id == last_destination_texture)
FlushVertexBuffer();
glDeleteTextures(1, &surface->texture_id);
free(surface);
}
@ -850,6 +862,10 @@ void Backend_UnlockSurface(Backend_Surface *surface, unsigned int width, unsigne
if (surface == NULL)
return;
// Flush the vertex buffer if we're about to modify its texture
if (surface->texture_id == last_source_texture || surface->texture_id == last_destination_texture)
FlushVertexBuffer();
GLint previously_bound_texture;
glGetIntegerv(GL_TEXTURE_BINDING_2D, &previously_bound_texture);
@ -866,9 +882,6 @@ void Backend_UnlockSurface(Backend_Surface *surface, unsigned int width, unsigne
void Backend_Blit(Backend_Surface *source_surface, const RECT *rect, Backend_Surface *destination_surface, long x, long y, BOOL colour_key)
{
static Backend_Surface *last_source_surface;
static Backend_Surface *last_destination_surface;
if (source_surface == NULL || destination_surface == NULL)
return;
@ -878,13 +891,13 @@ void Backend_Blit(Backend_Surface *source_surface, const RECT *rect, Backend_Sur
const RenderMode render_mode = (colour_key ? MODE_DRAW_SURFACE_WITH_TRANSPARENCY : MODE_DRAW_SURFACE);
// Flush vertex data if a context-change is needed
if (last_render_mode != render_mode || last_source_surface != source_surface || last_destination_surface != destination_surface)
if (last_render_mode != render_mode || last_source_texture != source_surface->texture_id || last_destination_texture != destination_surface->texture_id)
{
FlushVertexBuffer();
last_render_mode = render_mode;
last_source_surface = source_surface;
last_destination_surface = destination_surface;
last_source_texture = source_surface->texture_id;
last_destination_texture = destination_surface->texture_id;
// Point our framebuffer to the destination texture
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, destination_surface->texture_id, 0);
@ -945,7 +958,6 @@ void Backend_Blit(Backend_Surface *source_surface, const RECT *rect, Backend_Sur
void Backend_ColourFill(Backend_Surface *surface, const RECT *rect, unsigned char red, unsigned char green, unsigned char blue)
{
static Backend_Surface *last_surface;
static unsigned char last_red;
static unsigned char last_green;
static unsigned char last_blue;
@ -957,12 +969,13 @@ void Backend_ColourFill(Backend_Surface *surface, const RECT *rect, unsigned cha
return;
// Flush vertex data if a context-change is needed
if (last_render_mode != MODE_COLOUR_FILL || last_surface != surface || last_red != red || last_green != green || last_blue != blue)
if (last_render_mode != MODE_COLOUR_FILL || last_destination_texture != surface->texture_id || last_red != red || last_green != green || last_blue != blue)
{
FlushVertexBuffer();
last_render_mode = MODE_COLOUR_FILL;
last_surface = surface;
last_source_texture = 0;
last_destination_texture = surface->texture_id;
last_red = red;
last_green = green;
last_blue = blue;