michael@0: /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #include "WebGLContext.h"
michael@0: #include "WebGLTexture.h"
michael@0: #include "WebGLRenderbuffer.h"
michael@0: #include "WebGLFramebuffer.h"
michael@0: #include "GLContext.h"
michael@0: 
michael@0: using namespace mozilla;
michael@0: 
michael@0: void
michael@0: WebGLContext::Clear(GLbitfield mask)
michael@0: {
michael@0:     if (IsContextLost())
michael@0:         return;
michael@0: 
michael@0:     MakeContextCurrent();
michael@0: 
michael@0:     uint32_t m = mask & (LOCAL_GL_COLOR_BUFFER_BIT | LOCAL_GL_DEPTH_BUFFER_BIT | LOCAL_GL_STENCIL_BUFFER_BIT);
michael@0:     if (mask != m)
michael@0:         return ErrorInvalidValue("clear: invalid mask bits");
michael@0: 
michael@0:     if (mask == 0) {
michael@0:         GenerateWarning("Calling gl.clear(0) has no effect.");
michael@0:     } else if (mRasterizerDiscardEnabled) {
michael@0:         GenerateWarning("Calling gl.clear() with RASTERIZER_DISCARD enabled has no effects.");
michael@0:     }
michael@0: 
michael@0:     if (mBoundFramebuffer) {
michael@0:         if (!mBoundFramebuffer->CheckAndInitializeAttachments())
michael@0:             return ErrorInvalidFramebufferOperation("clear: incomplete framebuffer");
michael@0: 
michael@0:         gl->fClear(mask);
michael@0:         return;
michael@0:     } else {
michael@0:         ClearBackbufferIfNeeded();
michael@0:     }
michael@0: 
michael@0:     // Ok, we're clearing the default framebuffer/screen.
michael@0: 
michael@0:     gl->fClear(mask);
michael@0: 
michael@0:     Invalidate();
michael@0:     mShouldPresent = true;
michael@0: }
michael@0: 
michael@0: static GLclampf
michael@0: GLClampFloat(GLclampf val)
michael@0: {
michael@0:     if (val < 0.0)
michael@0:         return 0.0;
michael@0: 
michael@0:     if (val > 1.0)
michael@0:         return 1.0;
michael@0: 
michael@0:     return val;
michael@0: }
michael@0: 
michael@0: void
michael@0: WebGLContext::ClearColor(GLclampf r, GLclampf g,
michael@0:                              GLclampf b, GLclampf a)
michael@0: {
michael@0:     if (IsContextLost())
michael@0:         return;
michael@0: 
michael@0:     MakeContextCurrent();
michael@0:     mColorClearValue[0] = GLClampFloat(r);
michael@0:     mColorClearValue[1] = GLClampFloat(g);
michael@0:     mColorClearValue[2] = GLClampFloat(b);
michael@0:     mColorClearValue[3] = GLClampFloat(a);
michael@0:     gl->fClearColor(r, g, b, a);
michael@0: }
michael@0: 
michael@0: void
michael@0: WebGLContext::ClearDepth(GLclampf v)
michael@0: {
michael@0:     if (IsContextLost())
michael@0:         return;
michael@0: 
michael@0:     MakeContextCurrent();
michael@0:     mDepthClearValue = GLClampFloat(v);
michael@0:     gl->fClearDepth(v);
michael@0: }
michael@0: 
michael@0: void
michael@0: WebGLContext::ClearStencil(GLint v)
michael@0: {
michael@0:     if (IsContextLost())
michael@0:         return;
michael@0: 
michael@0:     MakeContextCurrent();
michael@0:     mStencilClearValue = v;
michael@0:     gl->fClearStencil(v);
michael@0: }
michael@0: 
michael@0: void
michael@0: WebGLContext::ColorMask(WebGLboolean r, WebGLboolean g, WebGLboolean b, WebGLboolean a)
michael@0: {
michael@0:     if (IsContextLost())
michael@0:         return;
michael@0: 
michael@0:     MakeContextCurrent();
michael@0:     mColorWriteMask[0] = r;
michael@0:     mColorWriteMask[1] = g;
michael@0:     mColorWriteMask[2] = b;
michael@0:     mColorWriteMask[3] = a;
michael@0:     gl->fColorMask(r, g, b, a);
michael@0: }
michael@0: 
michael@0: void
michael@0: WebGLContext::DepthMask(WebGLboolean b)
michael@0: {
michael@0:     if (IsContextLost())
michael@0:         return;
michael@0: 
michael@0:     MakeContextCurrent();
michael@0:     mDepthWriteMask = b;
michael@0:     gl->fDepthMask(b);
michael@0: }
michael@0: 
michael@0: void
michael@0: WebGLContext::DrawBuffers(const dom::Sequence<GLenum>& buffers)
michael@0: {
michael@0:     if (IsContextLost())
michael@0:         return;
michael@0: 
michael@0:     const size_t buffersLength = buffers.Length();
michael@0: 
michael@0:     if (buffersLength == 0) {
michael@0:         return ErrorInvalidValue("drawBuffers: invalid <buffers> (buffers must not be empty)");
michael@0:     }
michael@0: 
michael@0:     if (mBoundFramebuffer == 0)
michael@0:     {
michael@0:         // OK: we are rendering in the default framebuffer
michael@0: 
michael@0:         /* EXT_draw_buffers :
michael@0:          If the GL is bound to the default framebuffer, then <buffersLength> must be 1
michael@0:          and the constant must be BACK or NONE. When draw buffer zero is
michael@0:          BACK, color values are written into the sole buffer for single-
michael@0:          buffered contexts, or into the back buffer for double-buffered
michael@0:          contexts. If DrawBuffersEXT is supplied with a constant other than
michael@0:          BACK and NONE, the error INVALID_OPERATION is generated.
michael@0:          */
michael@0:         if (buffersLength != 1) {
michael@0:             return ErrorInvalidValue("drawBuffers: invalid <buffers> (main framebuffer: buffers.length must be 1)");
michael@0:         }
michael@0: 
michael@0:         MakeContextCurrent();
michael@0: 
michael@0:         if (buffers[0] == LOCAL_GL_NONE) {
michael@0:             const GLenum drawBuffersCommand = LOCAL_GL_NONE;
michael@0:             gl->fDrawBuffers(1, &drawBuffersCommand);
michael@0:             return;
michael@0:         }
michael@0:         else if (buffers[0] == LOCAL_GL_BACK) {
michael@0:             const GLenum drawBuffersCommand = LOCAL_GL_COLOR_ATTACHMENT0;
michael@0:             gl->fDrawBuffers(1, &drawBuffersCommand);
michael@0:             return;
michael@0:         }
michael@0:         return ErrorInvalidOperation("drawBuffers: invalid operation (main framebuffer: buffers[0] must be GL_NONE or GL_BACK)");
michael@0:     }
michael@0: 
michael@0:     // OK: we are rendering in a framebuffer object
michael@0: 
michael@0:     if (buffersLength > size_t(mGLMaxDrawBuffers)) {
michael@0:         /* EXT_draw_buffers :
michael@0:          The maximum number of draw buffers is implementation-dependent. The
michael@0:          number of draw buffers supported can be queried by calling
michael@0:          GetIntegerv with the symbolic constant MAX_DRAW_BUFFERS_EXT. An
michael@0:          INVALID_VALUE error is generated if <buffersLength> is greater than
michael@0:          MAX_DRAW_BUFFERS_EXT.
michael@0:          */
michael@0:         return ErrorInvalidValue("drawBuffers: invalid <buffers> (buffers.length > GL_MAX_DRAW_BUFFERS)");
michael@0:     }
michael@0: 
michael@0:     for (uint32_t i = 0; i < buffersLength; i++)
michael@0:     {
michael@0:         /* EXT_draw_buffers :
michael@0:          If the GL is bound to a draw framebuffer object, the <i>th buffer listed
michael@0:          in <bufs> must be COLOR_ATTACHMENT<i>_EXT or NONE. Specifying a
michael@0:          buffer out of order, BACK, or COLOR_ATTACHMENT<m>_EXT where <m> is
michael@0:          greater than or equal to the value of MAX_COLOR_ATTACHMENTS_EXT,
michael@0:          will generate the error INVALID_OPERATION.
michael@0:          */
michael@0:         /* WEBGL_draw_buffers :
michael@0:          The value of the MAX_COLOR_ATTACHMENTS_WEBGL parameter must be greater than or equal to that of the MAX_DRAW_BUFFERS_WEBGL parameter.
michael@0:          */
michael@0:         if (buffers[i] != LOCAL_GL_NONE &&
michael@0:             buffers[i] != GLenum(LOCAL_GL_COLOR_ATTACHMENT0 + i)) {
michael@0:             return ErrorInvalidOperation("drawBuffers: invalid operation (buffers[i] must be GL_NONE or GL_COLOR_ATTACHMENTi)");
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     MakeContextCurrent();
michael@0: 
michael@0:     gl->fDrawBuffers(buffersLength, buffers.Elements());
michael@0: }
michael@0: 
michael@0: void
michael@0: WebGLContext::StencilMask(GLuint mask)
michael@0: {
michael@0:     if (IsContextLost())
michael@0:         return;
michael@0: 
michael@0:     mStencilWriteMaskFront = mask;
michael@0:     mStencilWriteMaskBack = mask;
michael@0: 
michael@0:     MakeContextCurrent();
michael@0:     gl->fStencilMask(mask);
michael@0: }
michael@0: 
michael@0: void
michael@0: WebGLContext::StencilMaskSeparate(GLenum face, GLuint mask)
michael@0: {
michael@0:     if (IsContextLost())
michael@0:         return;
michael@0: 
michael@0:     if (!ValidateFaceEnum(face, "stencilMaskSeparate: face"))
michael@0:         return;
michael@0: 
michael@0:     switch (face) {
michael@0:         case LOCAL_GL_FRONT_AND_BACK:
michael@0:             mStencilWriteMaskFront = mask;
michael@0:             mStencilWriteMaskBack = mask;
michael@0:             break;
michael@0:         case LOCAL_GL_FRONT:
michael@0:             mStencilWriteMaskFront = mask;
michael@0:             break;
michael@0:         case LOCAL_GL_BACK:
michael@0:             mStencilWriteMaskBack = mask;
michael@0:             break;
michael@0:     }
michael@0: 
michael@0:     MakeContextCurrent();
michael@0:     gl->fStencilMaskSeparate(face, mask);
michael@0: }
michael@0: 
michael@0: 
michael@0: 
michael@0: