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Implements nanovg's framebuffer helper functions. (#869)

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This commit ports nanovg's helper functions for rendering stuff in framebuffer defined in `nanovg_gl_utils.h`. Also, a new `nvgState()` function is created for bgfx backend so it is possible to blend between framebuffers, which feature is long requested but not yet supported in original nanovg. The `nvgState()` function can be called between `nvgBeginFrame()` and `nvgEndFrame()`.
This commit is contained in:
Olli Wang 2016-08-08 23:33:37 +08:00 committed by Branimir Karadžić
parent 41ce24c078
commit f11d954bc1
2 changed files with 110 additions and 11 deletions
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85
examples/common/nanovg/nanovg_bgfx.cpp
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@ -548,6 +548,7 @@ namespace
static void nvgRenderViewport(void* _userPtr, int width, int height, float devicePixelRatio)
{
struct GLNVGcontext* gl = (struct GLNVGcontext*)_userPtr;
gl->state = 0;
gl->view[0] = (float)width;
gl->view[1] = (float)height;
bgfx::setViewRect(gl->m_viewId, 0, 0, width * devicePixelRatio, height * devicePixelRatio);
@ -722,11 +723,8 @@ namespace
memcpy(gl->tvb.data, gl->verts, gl->nverts * sizeof(struct NVGvertex) );
gl->state = 0
| BGFX_STATE_RGB_WRITE
| BGFX_STATE_ALPHA_WRITE
;
if (gl->state == 0)
{
// if (alphaBlend == NVG_PREMULTIPLIED_ALPHA)
// {
// gl->state |= BGFX_STATE_BLEND_FUNC_SEPARATE(
@ -735,11 +733,11 @@ namespace
// );
// }
// else
{
gl->state |= BGFX_STATE_BLEND_FUNC(
gl->state = BGFX_STATE_BLEND_FUNC(
BGFX_STATE_BLEND_SRC_ALPHA, BGFX_STATE_BLEND_INV_SRC_ALPHA
);
}
gl->state |= BGFX_STATE_RGB_WRITE | BGFX_STATE_ALPHA_WRITE;
bgfx::setUniform(gl->u_viewSize, gl->view);
@ -1089,7 +1087,26 @@ error:
}
NVGcontext* nvgCreate(int edgeaa, unsigned char _viewId) {
return nvgCreate(edgeaa, _viewId, NULL);
return nvgCreate(edgeaa, _viewId, NULL);
}
void nvgDelete(struct NVGcontext* ctx)
{
nvgDeleteInternal(ctx);
}
void nvgState(struct NVGcontext* ctx, uint64_t state)
{
struct NVGparams* params = nvgInternalParams(ctx);
struct GLNVGcontext* gl = (struct GLNVGcontext*)params->userPtr;
gl->state = state;
}
uint8_t nvgViewId(struct NVGcontext* ctx)
{
struct NVGparams* params = nvgInternalParams(ctx);
struct GLNVGcontext* gl = (struct GLNVGcontext*)params->userPtr;
return gl->m_viewId;
}
void nvgViewId(struct NVGcontext* ctx, unsigned char _viewId)
@ -1099,7 +1116,55 @@ void nvgViewId(struct NVGcontext* ctx, unsigned char _viewId)
gl->m_viewId = uint8_t(_viewId);
}
void nvgDelete(struct NVGcontext* ctx)
bgfx::TextureHandle nvglImageHandle(NVGcontext* ctx, int image)
{
nvgDeleteInternal(ctx);
GLNVGcontext* gl = (GLNVGcontext*)nvgInternalParams(ctx)->userPtr;
GLNVGtexture* tex = glnvg__findTexture(gl, image);
return tex->id;
}
NVGLUframebuffer* nvgluCreateFramebuffer(NVGcontext* ctx, int width,
int height, int imageFlags) {
NVGLUframebuffer* framebuffer = new NVGLUframebuffer;
framebuffer->ctx = ctx;
framebuffer->image = nvgCreateImageRGBA(ctx, width, height,
imageFlags, NULL);
bgfx::TextureHandle texture = nvglImageHandle(ctx, framebuffer->image);
if (!bgfx::isValid(texture)) {
nvgluDeleteFramebuffer(framebuffer);
return NULL;
}
framebuffer->handle = bgfx::createFrameBuffer(1, &texture, false);
if (!bgfx::isValid(framebuffer->handle))
{
nvgluDeleteFramebuffer(framebuffer);
return NULL;
}
static uint8_t s_ViewId = 1; // may have a better way to assign new view id
framebuffer->viewId = s_ViewId++;
bgfx::setViewFrameBuffer(framebuffer->viewId, framebuffer->handle);
bgfx::setViewSeq(framebuffer->viewId, true);
return framebuffer;
}
void nvgluBindFramebuffer(NVGLUframebuffer* framebuffer) {
static NVGcontext* s_prevCtx = NULL;
static uint8_t s_prevViewId;
if (framebuffer != NULL) {
s_prevCtx = framebuffer->ctx;
s_prevViewId = nvgViewId(framebuffer->ctx);
nvgViewId(framebuffer->ctx, framebuffer->viewId);
} else if (s_prevCtx != NULL) {
nvgViewId(s_prevCtx, s_prevViewId);
}
}
void nvgluDeleteFramebuffer(NVGLUframebuffer* framebuffer) {
if (framebuffer == NULL)
return;
if (framebuffer->image >= 0)
nvgDeleteImage(framebuffer->ctx, framebuffer->image);
if (bgfx::isValid(framebuffer->handle))
bgfx::destroyFrameBuffer(framebuffer->handle);
delete framebuffer;
}

36
examples/common/nanovg/nanovg_bgfx.h
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@ -6,13 +6,47 @@
#ifndef NANOVG_BGFX_H_HEADER_GUARD
#define NANOVG_BGFX_H_HEADER_GUARD
#include "bgfx/bgfx.h"
namespace bx { struct AllocatorI; }
struct NVGcontext;
struct NVGLUframebuffer {
NVGcontext* ctx;
bgfx::FrameBufferHandle handle;
int image;
uint8_t viewId;
};
typedef struct NVGLUframebuffer NVGLUframebuffer;
NVGcontext* nvgCreate(int edgeaa, unsigned char _viewId, bx::AllocatorI* _allocator);
NVGcontext* nvgCreate(int edgeaa, unsigned char _viewId);
void nvgViewId(struct NVGcontext* ctx, unsigned char _viewId);
void nvgDelete(struct NVGcontext* ctx);
void nvgState(struct NVGcontext* ctx, uint64_t state);
uint8_t nvgViewId(struct NVGcontext* ctx);
void nvgViewId(struct NVGcontext* ctx, unsigned char _viewId);
// Helper functions to create bgfx framebuffer to render to.
// Example:
// float scale = 2;
// NVGLUframebuffer* fb = nvgluCreateFramebuffer(ctx, 100 * scale, 100 * scale, 0);
// nvgluBindFramebuffer(fb);
// nvgBeginFrame(ctx, 100, 100, scale);
// // renders anything offscreen
// nvgEndFrame(ctx);
// nvgluBindFramebuffer(NULL);
//
// // Pastes the framebuffer rendering.
// nvgBeginFrame(ctx, 1024, 768, scale);
// NVGpaint paint = nvgImagePattern(ctx, 0, 0, 100, 100, 0, fb->image, 1);
// nvgBeginPath(ctx);
// nvgRect(ctx, 0, 0, 100, 100);
// nvgFillPaint(ctx, paint);
// nvgFill(ctx);
// nvgEndFrame(ctx);
NVGLUframebuffer* nvgluCreateFramebuffer(NVGcontext* ctx, int width, int height, int imageFlags);
void nvgluBindFramebuffer(NVGLUframebuffer* framebuffer);
void nvgluDeleteFramebuffer(NVGLUframebuffer* framebuffer);
#endif // NANOVG_BGFX_H_HEADER_GUARD