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Implement glow/bloom on compatibility renderer #87360

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Feb 20, 2024
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Implement glow/bloom on compatibility renderer #87360

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6 changes: 4 additions & 2 deletions drivers/gles3/effects/copy_effects.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -155,12 +155,14 @@ void CopyEffects::copy_to_and_from_rect(const Rect2 &p_rect) {
draw_screen_quad();
}

void CopyEffects::copy_screen() {
bool success = copy.shader.version_bind_shader(copy.shader_version, CopyShaderGLES3::MODE_DEFAULT);
void CopyEffects::copy_screen(float p_multiply) {
bool success = copy.shader.version_bind_shader(copy.shader_version, CopyShaderGLES3::MODE_SCREEN);
if (!success) {
return;
}

copy.shader.version_set_uniform(CopyShaderGLES3::MULTIPLY, p_multiply, copy.shader_version, CopyShaderGLES3::MODE_SCREEN);

draw_screen_triangle();
}

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4 changes: 2 additions & 2 deletions drivers/gles3/effects/copy_effects.h
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Original file line number Diff line number Diff line change
Expand Up @@ -33,7 +33,7 @@

#ifdef GLES3_ENABLED

#include "drivers/gles3/shaders/copy.glsl.gen.h"
#include "drivers/gles3/shaders/effects/copy.glsl.gen.h"

namespace GLES3 {

Expand Down Expand Up @@ -64,7 +64,7 @@ class CopyEffects {
void copy_to_rect(const Rect2 &p_rect);
void copy_to_rect_3d(const Rect2 &p_rect, float p_layer, int p_type, float p_lod = 0.0f);
void copy_to_and_from_rect(const Rect2 &p_rect);
void copy_screen();
void copy_screen(float p_multiply = 1.0);
void copy_cube_to_rect(const Rect2 &p_rect);
void copy_cube_to_panorama(float p_mip_level);
void bilinear_blur(GLuint p_source_texture, int p_mipmap_count, const Rect2i &p_region);
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172 changes: 172 additions & 0 deletions drivers/gles3/effects/glow.cpp
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Original file line number Diff line number Diff line change
@@ -0,0 +1,172 @@
/**************************************************************************/
/* glow.cpp */
/**************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/**************************************************************************/
/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/**************************************************************************/

#ifdef GLES3_ENABLED

#include "glow.h"

using namespace GLES3;

Glow *Glow::singleton = nullptr;

Glow *Glow::get_singleton() {
return singleton;
}

Glow::Glow() {
singleton = this;

glow.shader.initialize();
glow.shader_version = glow.shader.version_create();

{ // Screen Triangle.
glGenBuffers(1, &screen_triangle);
glBindBuffer(GL_ARRAY_BUFFER, screen_triangle);

const float qv[6] = {
-1.0f,
-1.0f,
3.0f,
-1.0f,
-1.0f,
3.0f,
};

glBufferData(GL_ARRAY_BUFFER, sizeof(float) * 6, qv, GL_STATIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, 0); //unbind

glGenVertexArrays(1, &screen_triangle_array);
glBindVertexArray(screen_triangle_array);
glBindBuffer(GL_ARRAY_BUFFER, screen_triangle);
glVertexAttribPointer(RS::ARRAY_VERTEX, 2, GL_FLOAT, GL_FALSE, sizeof(float) * 2, nullptr);
glEnableVertexAttribArray(RS::ARRAY_VERTEX);
glBindVertexArray(0);
glBindBuffer(GL_ARRAY_BUFFER, 0); //unbind
}
}

Glow::~Glow() {
glDeleteBuffers(1, &screen_triangle);
glDeleteVertexArrays(1, &screen_triangle_array);

glow.shader.version_free(glow.shader_version);

singleton = nullptr;
}

void Glow::_draw_screen_triangle() {
glBindVertexArray(screen_triangle_array);
glDrawArrays(GL_TRIANGLES, 0, 3);
glBindVertexArray(0);
}

void Glow::process_glow(GLuint p_source_color, Size2i p_size, const Glow::GLOWLEVEL *p_glow_buffers, uint32_t p_view, bool p_use_multiview) {
ERR_FAIL_COND(p_source_color == 0);
ERR_FAIL_COND(p_glow_buffers[3].color == 0);

// Reset some OpenGL state...
glDisable(GL_BLEND);
glDisable(GL_DEPTH_TEST);
glDepthMask(GL_FALSE);

// Start with our filter pass
{
glBindFramebuffer(GL_FRAMEBUFFER, p_glow_buffers[0].fbo);
glViewport(0, 0, p_glow_buffers[0].size.x, p_glow_buffers[0].size.y);

glActiveTexture(GL_TEXTURE0);
glBindTexture(p_use_multiview ? GL_TEXTURE_2D_ARRAY : GL_TEXTURE_2D, p_source_color);

uint64_t specialization = p_use_multiview ? GlowShaderGLES3::USE_MULTIVIEW : 0;
bool success = glow.shader.version_bind_shader(glow.shader_version, GlowShaderGLES3::MODE_FILTER, specialization);
if (!success) {
return;
}

glow.shader.version_set_uniform(GlowShaderGLES3::PIXEL_SIZE, 1.0 / p_glow_buffers[0].size.x, 1.0 / p_glow_buffers[0].size.y, glow.shader_version, GlowShaderGLES3::MODE_FILTER, specialization);
glow.shader.version_set_uniform(GlowShaderGLES3::VIEW, float(p_view), glow.shader_version, GlowShaderGLES3::MODE_FILTER, specialization);
glow.shader.version_set_uniform(GlowShaderGLES3::LUMINANCE_MULTIPLIER, luminance_multiplier, glow.shader_version, GlowShaderGLES3::MODE_FILTER, specialization);
glow.shader.version_set_uniform(GlowShaderGLES3::GLOW_BLOOM, glow_bloom, glow.shader_version, GlowShaderGLES3::MODE_FILTER, specialization);
glow.shader.version_set_uniform(GlowShaderGLES3::GLOW_HDR_THRESHOLD, glow_hdr_bleed_threshold, glow.shader_version, GlowShaderGLES3::MODE_FILTER, specialization);
glow.shader.version_set_uniform(GlowShaderGLES3::GLOW_HDR_SCALE, glow_hdr_bleed_scale, glow.shader_version, GlowShaderGLES3::MODE_FILTER, specialization);
glow.shader.version_set_uniform(GlowShaderGLES3::GLOW_LUMINANCE_CAP, glow_hdr_luminance_cap, glow.shader_version, GlowShaderGLES3::MODE_FILTER, specialization);

_draw_screen_triangle();
}

// Continue with downsampling
{
bool success = glow.shader.version_bind_shader(glow.shader_version, GlowShaderGLES3::MODE_DOWNSAMPLE, 0);
if (!success) {
return;
}

for (int i = 1; i < 4; i++) {
glBindFramebuffer(GL_FRAMEBUFFER, p_glow_buffers[i].fbo);
glViewport(0, 0, p_glow_buffers[i].size.x, p_glow_buffers[i].size.y);

glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, p_glow_buffers[i - 1].color);

glow.shader.version_set_uniform(GlowShaderGLES3::PIXEL_SIZE, 1.0 / p_glow_buffers[i].size.x, 1.0 / p_glow_buffers[i].size.y, glow.shader_version, GlowShaderGLES3::MODE_DOWNSAMPLE);

_draw_screen_triangle();
}
}

// Now upsample
{
bool success = glow.shader.version_bind_shader(glow.shader_version, GlowShaderGLES3::MODE_UPSAMPLE, 0);
if (!success) {
return;
}

for (int i = 2; i >= 0; i--) {
glBindFramebuffer(GL_FRAMEBUFFER, p_glow_buffers[i].fbo);
glViewport(0, 0, p_glow_buffers[i].size.x, p_glow_buffers[i].size.y);

glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, p_glow_buffers[i + 1].color);

glow.shader.version_set_uniform(GlowShaderGLES3::PIXEL_SIZE, 1.0 / p_glow_buffers[i].size.x, 1.0 / p_glow_buffers[i].size.y, glow.shader_version, GlowShaderGLES3::MODE_UPSAMPLE);

_draw_screen_triangle();
}
}

glDisable(GL_BLEND);
glEnable(GL_DEPTH_TEST);
glDepthMask(GL_TRUE);
glUseProgram(0);
glBindTexture(GL_TEXTURE_2D, 0);
glBindFramebuffer(GL_FRAMEBUFFER, 0);
}

#endif // GLES3_ENABLED
89 changes: 89 additions & 0 deletions drivers/gles3/effects/glow.h
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Original file line number Diff line number Diff line change
@@ -0,0 +1,89 @@
/**************************************************************************/
/* glow.h */
/**************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/**************************************************************************/
/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/**************************************************************************/

#ifndef GLOW_GLES3_H
#define GLOW_GLES3_H

#ifdef GLES3_ENABLED

#include "drivers/gles3/shaders/effects/glow.glsl.gen.h"

namespace GLES3 {

class Glow {
private:
static Glow *singleton;

struct GLOW {
GlowShaderGLES3 shader;
RID shader_version;
} glow;

float luminance_multiplier = 1.0;

float glow_intensity = 1.0;
float glow_bloom = 0.0;
float glow_hdr_bleed_threshold = 1.0;
float glow_hdr_bleed_scale = 2.0;
float glow_hdr_luminance_cap = 12.0;

// Use for full-screen effects. Slightly more efficient than screen_quad as this eliminates pixel overdraw along the diagonal.
GLuint screen_triangle = 0;
GLuint screen_triangle_array = 0;

void _draw_screen_triangle();

public:
struct GLOWLEVEL {
Size2i size;
GLuint color = 0;
GLuint fbo = 0;
};

static Glow *get_singleton();

Glow();
~Glow();

void set_intensity(float p_value) { glow_intensity = p_value; }
void set_luminance_multiplier(float p_luminance_multiplier) { luminance_multiplier = p_luminance_multiplier; }
void set_glow_bloom(float p_bloom) { glow_bloom = p_bloom; }
void set_glow_hdr_bleed_threshold(float p_threshold) { glow_hdr_bleed_threshold = p_threshold; }
void set_glow_hdr_bleed_scale(float p_scale) { glow_hdr_bleed_scale = p_scale; }
void set_glow_hdr_luminance_cap(float p_cap) { glow_hdr_luminance_cap = p_cap; }

void process_glow(GLuint p_source_color, Size2i p_size, const GLOWLEVEL *p_glow_buffers, uint32_t p_view = 0, bool p_use_multiview = false);
};

} //namespace GLES3

#endif // GLES3_ENABLED

#endif // GLOW_GLES3_H
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