diff options
Diffstat (limited to 'drivers/gles3/effects/copy_effects.cpp')
| -rw-r--r-- | drivers/gles3/effects/copy_effects.cpp | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/drivers/gles3/effects/copy_effects.cpp b/drivers/gles3/effects/copy_effects.cpp index b8c56018dc..658c0e6145 100644 --- a/drivers/gles3/effects/copy_effects.cpp +++ b/drivers/gles3/effects/copy_effects.cpp @@ -31,6 +31,7 @@ #ifdef GLES3_ENABLED #include "copy_effects.h" +#include "../storage/texture_storage.h" using namespace GLES3; @@ -133,6 +134,7 @@ void CopyEffects::copy_screen() { draw_screen_triangle(); } +// Intended for efficiently mipmapping textures. void CopyEffects::bilinear_blur(GLuint p_source_texture, int p_mipmap_count, const Rect2i &p_region) { GLuint framebuffers[2]; glGenFramebuffers(2, framebuffers); @@ -158,6 +160,80 @@ void CopyEffects::bilinear_blur(GLuint p_source_texture, int p_mipmap_count, con glDeleteFramebuffers(2, framebuffers); } +// Intended for approximating a gaussian blur. Used for 2D backbuffer mipmaps. Slightly less efficient than bilinear_blur(). +void CopyEffects::gaussian_blur(GLuint p_source_texture, int p_mipmap_count, const Rect2i &p_region, const Size2i &p_size) { + GLuint framebuffer; + glGenFramebuffers(1, &framebuffer); + glBindFramebuffer(GL_FRAMEBUFFER, framebuffer); + + glActiveTexture(GL_TEXTURE0); + glBindTexture(GL_TEXTURE_2D, p_source_texture); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); + + Size2i base_size = p_size; + + Rect2i source_region = p_region; + Rect2i dest_region = p_region; + + Size2 float_size = Size2(p_size); + Rect2 normalized_source_region = Rect2(p_region); + normalized_source_region.position = normalized_source_region.position / float_size; + normalized_source_region.size = normalized_source_region.size / float_size; + Rect2 normalized_dest_region = Rect2(p_region); + for (int i = 1; i < p_mipmap_count; i++) { + dest_region.position.x >>= 1; + dest_region.position.y >>= 1; + dest_region.size.x = MAX(1, dest_region.size.x >> 1); + dest_region.size.y = MAX(1, dest_region.size.y >> 1); + base_size.x >>= 1; + base_size.y >>= 1; + + glBindTexture(GL_TEXTURE_2D, p_source_texture); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, i - 1); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, i - 1); + glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, p_source_texture, i); +#ifdef DEV_ENABLED + GLenum status = glCheckFramebufferStatus(GL_FRAMEBUFFER); + if (status != GL_FRAMEBUFFER_COMPLETE) { + WARN_PRINT("Could not bind Gaussian blur framebuffer, status: " + GLES3::TextureStorage::get_singleton()->get_framebuffer_error(status)); + } +#endif + + glViewport(0, 0, base_size.x, base_size.y); + + bool success = copy.shader.version_bind_shader(copy.shader_version, CopyShaderGLES3::MODE_GAUSSIAN_BLUR); + if (!success) { + return; + } + + float_size = Size2(base_size); + normalized_dest_region.position = Size2(dest_region.position) / float_size; + normalized_dest_region.size = Size2(dest_region.size) / float_size; + + copy.shader.version_set_uniform(CopyShaderGLES3::COPY_SECTION, normalized_dest_region.position.x, normalized_dest_region.position.y, normalized_dest_region.size.x, normalized_dest_region.size.y, copy.shader_version, CopyShaderGLES3::MODE_GAUSSIAN_BLUR); + copy.shader.version_set_uniform(CopyShaderGLES3::SOURCE_SECTION, normalized_source_region.position.x, normalized_source_region.position.y, normalized_source_region.size.x, normalized_source_region.size.y, copy.shader_version, CopyShaderGLES3::MODE_GAUSSIAN_BLUR); + copy.shader.version_set_uniform(CopyShaderGLES3::PIXEL_SIZE, 1.0 / float_size.x, 1.0 / float_size.y, copy.shader_version, CopyShaderGLES3::MODE_GAUSSIAN_BLUR); + + draw_screen_quad(); + + source_region = dest_region; + normalized_source_region = normalized_dest_region; + } + glBindFramebuffer(GL_FRAMEBUFFER, 0); + glDeleteFramebuffers(1, &framebuffer); + + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 0); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, p_mipmap_count - 1); + glBindTexture(GL_TEXTURE_2D, 0); + + glViewport(0, 0, p_size.x, p_size.y); +} + void CopyEffects::set_color(const Color &p_color, const Rect2i &p_region) { bool success = copy.shader.version_bind_shader(copy.shader_version, CopyShaderGLES3::MODE_SIMPLE_COLOR); if (!success) { |