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Merge pull request #1 from vktec/oit
Add order-independent transparency for translucent blocks
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src/main/java/me/jellysquid/mods/sodium/client/gl/TranslucencyFramebuffer.java
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,162 @@ | ||
| package me.jellysquid.mods.sodium.client.gl; | ||
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| import com.mojang.blaze3d.platform.GlStateManager; | ||
| import com.mojang.blaze3d.platform.FramebufferInfo; | ||
| import com.mojang.blaze3d.systems.RenderSystem; | ||
| import me.jellysquid.mods.sodium.client.gl.shader.GlProgram; | ||
| import me.jellysquid.mods.sodium.client.gl.shader.ShaderConstants; | ||
| import me.jellysquid.mods.sodium.client.gl.shader.ShaderLoader; | ||
| import me.jellysquid.mods.sodium.client.gl.shader.ShaderType; | ||
| import net.minecraft.client.gl.Framebuffer; | ||
| import net.minecraft.client.texture.TextureUtil; | ||
| import net.minecraft.util.Identifier; | ||
| import org.lwjgl.opengl.GL20; | ||
| import org.lwjgl.opengl.ARBTextureFloat; | ||
| import org.lwjgl.system.MemoryUtil; | ||
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| import java.nio.IntBuffer; | ||
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| public class TranslucencyFramebuffer extends Framebuffer { | ||
| private static GlProgram clearProgram = null; | ||
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| private int accumAttachment; | ||
| private int revealAttachment; | ||
| private int depthAttachment; | ||
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| public TranslucencyFramebuffer(int width, int height, boolean useDepth, boolean getError) { | ||
| super(width, height, useDepth, getError); | ||
| this.accumAttachment = -1; | ||
| this.revealAttachment = -1; | ||
| this.depthAttachment = -1; | ||
| } | ||
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| @Override | ||
| public void delete() { | ||
| super.delete(); | ||
| if (this.accumAttachment > -1) { | ||
| TextureUtil.deleteId(this.accumAttachment); | ||
| this.accumAttachment = -1; | ||
| } | ||
| if (this.revealAttachment > -1) { | ||
| TextureUtil.deleteId(this.revealAttachment); | ||
| this.revealAttachment = -1; | ||
| } | ||
| if (this.depthAttachment > -1) { | ||
| TextureUtil.deleteId(this.depthAttachment); | ||
| this.depthAttachment = -1; | ||
| } | ||
| } | ||
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| @Override | ||
| public void initFbo(int width, int height, boolean getError) { | ||
| RenderSystem.assertThread(RenderSystem::isOnRenderThreadOrInit); | ||
| this.viewportWidth = width; | ||
| this.viewportHeight = height; | ||
| this.textureWidth = width; | ||
| this.textureHeight = height; | ||
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| if (this.useDepthAttachment) { | ||
| this.depthAttachment = TextureUtil.generateId(); | ||
| GlStateManager.bindTexture(this.depthAttachment); | ||
| GlStateManager.texImage2D(GL20.GL_TEXTURE_2D, 0, GL20.GL_DEPTH_COMPONENT, width, height, 0, GL20.GL_DEPTH_COMPONENT, GL20.GL_FLOAT, null); | ||
| } | ||
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| this.accumAttachment = TextureUtil.generateId(); | ||
| this.revealAttachment = TextureUtil.generateId(); | ||
| // This duplicates a vanilla bug, where framebuffer attachments change back to linear filtering when resized. | ||
| // Shouldn't affect us because the translucency compositor samples texels directly, bypassing filtering altogether. | ||
| this.setTexFilter(GL20.GL_LINEAR); | ||
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| GlStateManager.bindTexture(this.accumAttachment); | ||
| GlStateManager.texImage2D(GL20.GL_TEXTURE_2D, 0, ARBTextureFloat.GL_RGBA16F_ARB, width, height, 0, GL20.GL_RGBA, GL20.GL_FLOAT, null); | ||
| GlStateManager.bindTexture(this.revealAttachment); | ||
| GlStateManager.texImage2D(GL20.GL_TEXTURE_2D, 0, GL20.GL_ALPHA8, width, height, 0, GL20.GL_ALPHA, GL20.GL_UNSIGNED_BYTE, null); | ||
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| this.fbo = GlStateManager.genFramebuffers(); | ||
| GlStateManager.bindFramebuffer(FramebufferInfo.FRAME_BUFFER, this.fbo); | ||
| GlStateManager.framebufferTexture2D(FramebufferInfo.FRAME_BUFFER, FramebufferInfo.COLOR_ATTACHMENT, GL20.GL_TEXTURE_2D, this.accumAttachment, 0); | ||
| GlStateManager.framebufferTexture2D(FramebufferInfo.FRAME_BUFFER, FramebufferInfo.COLOR_ATTACHMENT+1, GL20.GL_TEXTURE_2D, this.revealAttachment, 0); | ||
| if (this.useDepthAttachment) { | ||
| GlStateManager.framebufferTexture2D(FramebufferInfo.FRAME_BUFFER, FramebufferInfo.DEPTH_ATTACHMENT, GL20.GL_TEXTURE_2D, this.depthAttachment, 0); | ||
| } | ||
| this.checkFramebufferStatus(); | ||
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| IntBuffer attachments = MemoryUtil.memAllocInt(2); | ||
| attachments.put(0, FramebufferInfo.COLOR_ATTACHMENT); | ||
| attachments.put(1, FramebufferInfo.COLOR_ATTACHMENT+1); | ||
| GL20.glDrawBuffers(attachments); | ||
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| this.clear(getError); | ||
| this.endRead(); | ||
| } | ||
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| @Override | ||
| public void setTexFilter(int filter) { | ||
| RenderSystem.assertThread(RenderSystem::isOnRenderThreadOrInit); | ||
| this.texFilter = filter; | ||
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| GlStateManager.bindTexture(this.accumAttachment); | ||
| GlStateManager.texParameter(GL20.GL_TEXTURE_2D, GL20.GL_TEXTURE_MIN_FILTER, filter); | ||
| GlStateManager.texParameter(GL20.GL_TEXTURE_2D, GL20.GL_TEXTURE_MAG_FILTER, filter); | ||
| GlStateManager.texParameter(GL20.GL_TEXTURE_2D, GL20.GL_TEXTURE_WRAP_S, GL20.GL_CLAMP); | ||
| GlStateManager.texParameter(GL20.GL_TEXTURE_2D, GL20.GL_TEXTURE_WRAP_R, GL20.GL_CLAMP); | ||
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| GlStateManager.bindTexture(this.revealAttachment); | ||
| GlStateManager.texParameter(GL20.GL_TEXTURE_2D, GL20.GL_TEXTURE_MIN_FILTER, filter); | ||
| GlStateManager.texParameter(GL20.GL_TEXTURE_2D, GL20.GL_TEXTURE_MAG_FILTER, filter); | ||
| GlStateManager.texParameter(GL20.GL_TEXTURE_2D, GL20.GL_TEXTURE_WRAP_S, GL20.GL_CLAMP); | ||
| GlStateManager.texParameter(GL20.GL_TEXTURE_2D, GL20.GL_TEXTURE_WRAP_R, GL20.GL_CLAMP); | ||
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| GlStateManager.bindTexture(0); | ||
| } | ||
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| @Override | ||
| public void beginRead() { | ||
| RenderSystem.assertThread(RenderSystem::isOnRenderThread); | ||
| GlStateManager.bindTexture(this.accumAttachment); | ||
| } | ||
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| @Override | ||
| public void clear(boolean getError) { | ||
| RenderSystem.assertThread(RenderSystem::isOnRenderThreadOrInit); | ||
| this.beginWrite(true); | ||
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| if (TranslucencyFramebuffer.clearProgram == null) { | ||
| ShaderConstants empty = ShaderConstants.builder().build(); | ||
| TranslucencyFramebuffer.clearProgram = GlProgram.builder(new Identifier("sodium", "translucency_clear")) | ||
| .attachShader(ShaderLoader.loadShader(ShaderType.VERTEX, new Identifier("sodium", "fullscreen_gl20.v.glsl"), empty)) | ||
| .attachShader(ShaderLoader.loadShader(ShaderType.FRAGMENT, new Identifier("sodium", "translucency_clear_gl20.f.glsl"), empty)) | ||
| .build((program, name) -> new GlProgram(program, name) {}); | ||
| } | ||
| // clearColor is ignored, but that shouldn't cause problems unless someone misuses this class | ||
| // If we do need it in future, it can be done through a uniform | ||
| TranslucencyFramebuffer.clearProgram.bind(); | ||
| GlStateManager.disableDepthTest(); | ||
| GlStateManager.disableBlend(); | ||
| GL20.glDrawArrays(GL20.GL_TRIANGLES, 0, 3); | ||
| GlStateManager.enableBlend(); | ||
| GlStateManager.enableDepthTest(); | ||
| TranslucencyFramebuffer.clearProgram.unbind(); | ||
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| if (this.useDepthAttachment) { | ||
| GlStateManager.clear(GL20.GL_DEPTH_BUFFER_BIT, getError); | ||
| } | ||
| this.endWrite(); | ||
| } | ||
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| @Override | ||
| public int getColorAttachment() { | ||
| return this.accumAttachment; | ||
| } | ||
| @Override | ||
| public int getDepthAttachment() { | ||
| return this.depthAttachment; | ||
| } | ||
|
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| public int getAccumAttachment() { | ||
| return this.accumAttachment; | ||
| } | ||
| public int getRevealAttachment() { | ||
| return this.revealAttachment; | ||
| } | ||
| } |
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