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gfx: mipmaps and anisotropic filtering

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Raf committed 2025-12-04 18:09:49 +08:00
1 parent 7f68c46959
commit c303c81f88
9 files changed
+194 -50
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port/fast3d/gfx_opengl.cpp
+46 -8
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@@ -54,7 +54,9 @@ static uint32_t frame_count;
static std::vector<Framebuffer> framebuffers;
static size_t current_framebuffer;
static float current_noise_scale;
static int current_anisotropy_level;
static FilteringMode current_filter_mode = FILTER_LINEAR;
static MipmapFilteringMode current_mipmap_filter_mode = MIPMAP_LINEAR;
static bool current_textures_linear_filter[2] = {false, false};
static int gl_glsl_version = 130;
@@ -692,8 +694,11 @@ static void gfx_opengl_select_texture(int tile, GLuint texture_id, bool linear_f
current_textures_linear_filter[tile] = linear_filter;
}
static void gfx_opengl_upload_texture(const uint8_t* rgba32_buf, uint32_t width, uint32_t height) {
static void gfx_opengl_upload_texture(const uint8_t* rgba32_buf, uint32_t width, uint32_t height, bool gen_mipmaps) {
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, rgba32_buf);
if (gen_mipmaps || current_filter_mode == FILTER_THREE_POINT) {
glGenerateMipmap(GL_TEXTURE_2D);
}
}
static uint32_t gfx_cm_to_opengl(uint32_t val) {
@@ -710,11 +715,27 @@ static uint32_t gfx_cm_to_opengl(uint32_t val) {
return 0;
}
static void gfx_opengl_set_sampler_parameters(int tile, bool linear_filter, uint32_t cms, uint32_t cmt) {
const GLint filter = linear_filter && (current_filter_mode == FILTER_LINEAR) ? GL_LINEAR : GL_NEAREST;
glActiveTexture(GL_TEXTURE0 + tile);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, filter);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, filter);
static void gfx_opengl_set_sampler_parameters(int tile, bool linear_filter, uint32_t cms, uint32_t cmt, bool mipmaps) {
const GLint min_filters[3][3] = {
// MIPMAP_DISABLED MIPMAP_NEAREST MIPMAP_LINEAR
{GL_NEAREST, GL_NEAREST_MIPMAP_NEAREST, GL_NEAREST_MIPMAP_LINEAR}, // FILTER_NONE
{GL_LINEAR, GL_LINEAR_MIPMAP_NEAREST, GL_LINEAR_MIPMAP_LINEAR}, // FILTER_BILINEAR
{GL_LINEAR_MIPMAP_LINEAR, GL_LINEAR_MIPMAP_LINEAR, GL_LINEAR_MIPMAP_LINEAR}, // FILTER_TRILINEAR
};
mipmaps = mipmaps && (current_mipmap_filter_mode != MIPMAP_DISABLED);
const int mip_idx = mipmaps ? current_mipmap_filter_mode : 0;
const GLint min_filter = linear_filter ? min_filters[current_filter_mode][mip_idx] : GL_NEAREST;
const GLint max_filter = linear_filter && (current_filter_mode != FILTER_NONE) ? GL_LINEAR : GL_NEAREST;
glActiveTexture(GL_TEXTURE0 + tile);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, min_filter);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, max_filter);
if (mipmaps) {
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAX_ANISOTROPY, current_anisotropy_level);
}
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, gfx_cm_to_opengl(cms));
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, gfx_cm_to_opengl(cmt));
}
@@ -1244,7 +1265,21 @@ FilteringMode gfx_opengl_get_texture_filter(void) {
return current_filter_mode;
}
struct GfxRenderingAPI gfx_opengl_api = {
void gfx_opengl_set_mipmap_filter(MipmapFilteringMode mode) {
current_mipmap_filter_mode = mode;
}
static int gfx_opengl_get_max_anisotropy_level() {
GLfloat max_aniso_level;
glGetFloatv(GL_MAX_TEXTURE_MAX_ANISOTROPY, &max_aniso_level);
return (int)max_aniso_level;
}
static void gfx_opengl_set_anisotropy_level(int level) {
current_anisotropy_level = level;
}
struct GfxRenderingAPI gfx_opengl_api = {
gfx_opengl_get_name,
gfx_opengl_get_max_texture_size,
gfx_opengl_get_clip_parameters,
@@ -1279,5 +1314,8 @@ struct GfxRenderingAPI gfx_opengl_api = {
gfx_opengl_select_texture_fb,
gfx_opengl_delete_texture,
gfx_opengl_set_texture_filter,
gfx_opengl_get_texture_filter
gfx_opengl_get_texture_filter,
gfx_opengl_set_mipmap_filter,
gfx_opengl_set_anisotropy_level,
gfx_opengl_get_max_anisotropy_level
};