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use multiple textures to reduce latency

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FunkyFr3sh 2018-07-16 13:51:43 +02:00
parent d98cf4f6ea
commit c5975902ee
1 changed files with 50 additions and 34 deletions
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84
src/render.c
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@ -134,42 +134,52 @@ DWORD WINAPI render_main(void)
// primary surface texture
GLenum surfaceFormat = GL_LUMINANCE;
GLuint surfaceTexId = 0;
glGenTextures(1, &surfaceTexId);
glBindTexture(GL_TEXTURE_2D, surfaceTexId);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
GLuint surfaceTexIds[2];
while (glGetError() != GL_NO_ERROR);
glGenTextures(2, surfaceTexIds);
if (paletteConvProgram)
int i;
for (i = 0; i < 2; i++)
{
glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE8, tex_width, tex_height, 0, surfaceFormat = GL_LUMINANCE, GL_UNSIGNED_BYTE, 0);
glBindTexture(GL_TEXTURE_2D, surfaceTexIds[i]);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
if (glGetError() != GL_NO_ERROR)
glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, tex_width, tex_height, 0, surfaceFormat = GL_RED, GL_UNSIGNED_BYTE, 0);
while (glGetError() != GL_NO_ERROR);
if (glGetError() != GL_NO_ERROR)
glTexImage2D(GL_TEXTURE_2D, 0, GL_RED, tex_width, tex_height, 0, surfaceFormat = GL_RED, GL_UNSIGNED_BYTE, 0);
if (paletteConvProgram)
{
glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE8, tex_width, tex_height, 0, surfaceFormat = GL_LUMINANCE, GL_UNSIGNED_BYTE, 0);
if (!ddraw->autorenderer && glGetError() != GL_NO_ERROR) // very slow...
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, tex_width, tex_height, 0, surfaceFormat = GL_RED, GL_UNSIGNED_BYTE, 0);
if (glGetError() != GL_NO_ERROR)
glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, tex_width, tex_height, 0, surfaceFormat = GL_RED, GL_UNSIGNED_BYTE, 0);
if (glGetError() != GL_NO_ERROR)
glTexImage2D(GL_TEXTURE_2D, 0, GL_RED, tex_width, tex_height, 0, surfaceFormat = GL_RED, GL_UNSIGNED_BYTE, 0);
if (!ddraw->autorenderer && glGetError() != GL_NO_ERROR) // very slow...
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, tex_width, tex_height, 0, surfaceFormat = GL_RED, GL_UNSIGNED_BYTE, 0);
}
else
{
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, tex_width, tex_height, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
}
}
else
{
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, tex_width, tex_height, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
}
// palette texture
GLuint paletteTexId = 0;
glGenTextures(1, &paletteTexId);
glBindTexture(GL_TEXTURE_2D, paletteTexId);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, 256, 256, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
GLuint paletteTexIds[2];
glGenTextures(2, paletteTexIds);
for (i = 0; i < 2; i++)
{
glBindTexture(GL_TEXTURE_2D, paletteTexIds[i]);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, 256, 256, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
}
glViewport(
ddraw->render.viewport.x, ddraw->render.viewport.y,
@ -461,6 +471,8 @@ DWORD WINAPI render_main(void)
scale_w = (float)ddraw->width / tex_width;
scale_h = (float)ddraw->height / tex_height;
static int texIndex = 0, palIndex = 0;
BOOL scaleChanged = FALSE;
if (maxfps > 0)
@ -493,16 +505,20 @@ DWORD WINAPI render_main(void)
if (paletteConvProgram)
{
glBindTexture(GL_TEXTURE_2D, paletteTexId);
if (InterlockedExchange(&ddraw->render.paletteUpdated, FALSE))
{
palIndex = (palIndex + 1) % 2;
glBindTexture(GL_TEXTURE_2D, paletteTexIds[palIndex]);
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 256, 1, GL_RGBA, GL_UNSIGNED_BYTE,
ddraw->primary->palette->data_bgr);
}
glBindTexture(GL_TEXTURE_2D, surfaceTexId);
if (InterlockedExchange(&ddraw->render.surfaceUpdated, FALSE))
{
texIndex = (texIndex + 1) % 2;
glBindTexture(GL_TEXTURE_2D, surfaceTexIds[texIndex]);
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, ddraw->width, ddraw->height, surfaceFormat, GL_UNSIGNED_BYTE,
ddraw->primary->surface);
}
@ -540,7 +556,7 @@ DWORD WINAPI render_main(void)
if (!paletteConvProgram)
{
glBindTexture(GL_TEXTURE_2D, surfaceTexId);
glBindTexture(GL_TEXTURE_2D, surfaceTexIds[texIndex]);
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, ddraw->width, ddraw->height, GL_RGBA, GL_UNSIGNED_BYTE, tex);
}
@ -583,9 +599,9 @@ DWORD WINAPI render_main(void)
if (paletteConvProgram)
{
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, surfaceTexId);
glBindTexture(GL_TEXTURE_2D, surfaceTexIds[texIndex]);
glActiveTexture(GL_TEXTURE1);
glBindTexture(GL_TEXTURE_2D, paletteTexId);
glBindTexture(GL_TEXTURE_2D, paletteTexIds[palIndex]);
glActiveTexture(GL_TEXTURE0);
}
@ -657,8 +673,8 @@ DWORD WINAPI render_main(void)
}
HeapFree(GetProcessHeap(), 0, tex);
glDeleteTextures(1, &surfaceTexId);
glDeleteTextures(1, &paletteTexId);
glDeleteTextures(2, &surfaceTexIds);
glDeleteTextures(2, &paletteTexIds);
if (glUseProgram)
glUseProgram(0);