mirror of
https://github.com/hrydgard/ppsspp.git
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227 lines
8.4 KiB
C++
227 lines
8.4 KiB
C++
#include "StateMapping.h"
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#include "../../native/gfx_es2/gl_state.h"
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#include "../Math3D.h"
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#include "../GPUState.h"
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#include "../../Core/System.h"
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#include "../ge_constants.h"
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#include "DisplayListInterpreter.h"
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#include "ShaderManager.h"
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const GLint aLookup[] = {
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GL_DST_COLOR,
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GL_ONE_MINUS_DST_COLOR,
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GL_SRC_ALPHA,
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GL_ONE_MINUS_SRC_ALPHA,
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GL_DST_ALPHA,
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GL_ONE_MINUS_DST_ALPHA,
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GL_SRC_ALPHA, // should be 2x
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GL_ONE_MINUS_SRC_ALPHA, // should be 2x
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GL_DST_ALPHA, // should be 2x
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GL_ONE_MINUS_DST_ALPHA, // should be 2x - and COLOR?
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GL_CONSTANT_COLOR, // FIXA
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};
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const GLint bLookup[] = {
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GL_SRC_COLOR,
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GL_ONE_MINUS_SRC_COLOR,
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GL_SRC_ALPHA,
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GL_ONE_MINUS_SRC_ALPHA,
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GL_DST_ALPHA,
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GL_ONE_MINUS_DST_ALPHA,
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GL_SRC_ALPHA, // should be 2x
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GL_ONE_MINUS_SRC_ALPHA, // should be 2x
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GL_DST_ALPHA, // should be 2x
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GL_ONE_MINUS_DST_ALPHA, // should be 2x
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GL_CONSTANT_COLOR, // FIXB
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};
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const GLint eqLookup[] = {
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GL_FUNC_ADD,
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GL_FUNC_SUBTRACT,
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GL_FUNC_REVERSE_SUBTRACT,
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#if defined(USING_GLES2)
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GL_FUNC_ADD,
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GL_FUNC_ADD,
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#else
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GL_MIN,
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GL_MAX,
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#endif
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GL_FUNC_ADD, // should be abs(diff)
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};
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const GLint cullingMode[] = {
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GL_BACK,
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GL_FRONT,
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};
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const GLuint ztests[] =
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{
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GL_NEVER, GL_ALWAYS, GL_EQUAL, GL_NOTEQUAL,
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GL_LESS, GL_LEQUAL, GL_GREATER, GL_GEQUAL,
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};
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void ApplyDrawState()
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{
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// TODO: All this setup is soon so expensive that we'll need dirty flags, or simply do it in the command writes where we detect dirty by xoring. Silly to do all this work on every drawcall.
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// TODO: The top bit of the alpha channel should be written to the stencil bit somehow. This appears to require very expensive multipass rendering :( Alternatively, one could do a
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// single fullscreen pass that converts alpha to stencil (or 2 passes, to set both the 0 and 1 values) very easily.
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// Set cull
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bool wantCull = !gstate.isModeClear() && !gstate.isModeThrough() && gstate.isCullEnabled();
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glstate.cullFace.set(wantCull);
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if (wantCull) {
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u8 cullMode = gstate.getCullMode();
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glstate.cullFaceMode.set(cullingMode[cullMode]);
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}
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// Set blend
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bool wantBlend = !gstate.isModeClear() && (gstate.alphaBlendEnable & 1);
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glstate.blend.set(wantBlend);
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if(wantBlend) {
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// This can't be done exactly as there are several PSP blend modes that are impossible to do on OpenGL ES 2.0, and some even on regular OpenGL for desktop.
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// HOWEVER - we should be able to approximate the 2x modes in the shader, although they will clip wrongly.
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// Examples of seen unimplementable blend states:
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// Mortal Kombat Unchained: FixA=0000ff FixB=000080 FuncA=10 FuncB=10
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int blendFuncA = gstate.getBlendFuncA();
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int blendFuncB = gstate.getBlendFuncB();
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int blendFuncEq = gstate.getBlendEq();
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glstate.blendEquation.set(eqLookup[blendFuncEq]);
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if (blendFuncA != GE_SRCBLEND_FIXA && blendFuncB != GE_DSTBLEND_FIXB) {
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// All is valid, no blendcolor needed
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glstate.blendFunc.set(aLookup[blendFuncA], bLookup[blendFuncB]);
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} else {
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GLuint glBlendFuncA = blendFuncA == GE_SRCBLEND_FIXA ? GL_INVALID_ENUM : aLookup[blendFuncA];
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GLuint glBlendFuncB = blendFuncB == GE_DSTBLEND_FIXB ? GL_INVALID_ENUM : bLookup[blendFuncB];
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u32 fixA = gstate.getFixA();
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u32 fixB = gstate.getFixB();
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// Shortcut by using GL_ONE where possible, no need to set blendcolor
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if (glBlendFuncA == GL_INVALID_ENUM && blendFuncA == GE_SRCBLEND_FIXA) {
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if (fixA == 0xFFFFFF)
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glBlendFuncA = GL_ONE;
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else if (fixA == 0)
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glBlendFuncA = GL_ZERO;
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}
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if (glBlendFuncB == GL_INVALID_ENUM && blendFuncB == GE_DSTBLEND_FIXB) {
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if (fixB == 0xFFFFFF)
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glBlendFuncB = GL_ONE;
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else if (fixB == 0)
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glBlendFuncB = GL_ZERO;
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}
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if (glBlendFuncA == GL_INVALID_ENUM && glBlendFuncB != GL_INVALID_ENUM) {
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// Can use blendcolor trivially.
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const float blendColor[4] = {(fixA & 0xFF)/255.0f, ((fixA >> 8) & 0xFF)/255.0f, ((fixA >> 16) & 0xFF)/255.0f, 1.0f};
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glstate.blendColor.set(blendColor);
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glBlendFuncA = GL_CONSTANT_COLOR;
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} else if (glBlendFuncA != GL_INVALID_ENUM && glBlendFuncB == GL_INVALID_ENUM) {
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// Can use blendcolor trivially.
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const float blendColor[4] = {(fixB & 0xFF)/255.0f, ((fixB >> 8) & 0xFF)/255.0f, ((fixB >> 16) & 0xFF)/255.0f, 1.0f};
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glstate.blendColor.set(blendColor);
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glBlendFuncB = GL_CONSTANT_COLOR;
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} else if (glBlendFuncA == GL_INVALID_ENUM && glBlendFuncB == GL_INVALID_ENUM) { // Should also check for approximate equality
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if (fixA == (fixB ^ 0xFFFFFF)) {
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glBlendFuncA = GL_CONSTANT_COLOR;
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glBlendFuncB = GL_ONE_MINUS_CONSTANT_COLOR;
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const float blendColor[4] = {(fixA & 0xFF)/255.0f, ((fixA >> 8) & 0xFF)/255.0f, ((fixA >> 16) & 0xFF)/255.0f, 1.0f};
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glstate.blendColor.set(blendColor);
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} else if (fixA == fixB) {
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glBlendFuncA = GL_CONSTANT_COLOR;
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glBlendFuncB = GL_CONSTANT_COLOR;
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const float blendColor[4] = {(fixA & 0xFF)/255.0f, ((fixA >> 8) & 0xFF)/255.0f, ((fixA >> 16) & 0xFF)/255.0f, 1.0f};
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glstate.blendColor.set(blendColor);
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} else {
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DEBUG_LOG(HLE, "ERROR INVALID blendcolorstate: FixA=%06x FixB=%06x FuncA=%i FuncB=%i", gstate.getFixA(), gstate.getFixB(), gstate.getBlendFuncA(), gstate.getBlendFuncB());
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glBlendFuncA = GL_ONE;
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glBlendFuncB = GL_ONE;
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}
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}
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// At this point, through all paths above, glBlendFuncA and glBlendFuncB will be set somehow.
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glstate.blendFunc.set(glBlendFuncA, glBlendFuncB);
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}
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}
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bool wantDepthTest = gstate.isModeClear() || gstate.isDepthTestEnabled();
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glstate.depthTest.set(wantDepthTest);
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if(wantDepthTest) {
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// Force GL_ALWAYS if mode clear
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int depthTestFunc = gstate.isModeClear() ? 1 : gstate.getDepthTestFunc();
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glstate.depthFunc.set(ztests[depthTestFunc]);
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}
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bool wantDepthWrite = gstate.isModeClear() || gstate.isDepthWriteEnabled();
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glstate.depthWrite.set(wantDepthWrite ? GL_TRUE : GL_FALSE);
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float depthRangeMin = gstate_c.zOff - gstate_c.zScale;
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float depthRangeMax = gstate_c.zOff + gstate_c.zScale;
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glstate.depthRange.set(depthRangeMin, depthRangeMax);
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}
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void UpdateViewportAndProjection() {
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int renderWidth = PSP_CoreParameter().renderWidth;
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int renderHeight = PSP_CoreParameter().renderHeight;
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float renderWidthFactor = (float)renderWidth / 480.0f;
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float renderHeightFactor = (float)renderHeight / 272.0f;
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bool throughmode = (gstate.vertType & GE_VTYPE_THROUGH_MASK) != 0;
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// We can probably use these to simply set scissors? Maybe we need to offset by regionX1/Y1
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int regionX1 = gstate.region1 & 0x3FF;
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int regionY1 = (gstate.region1 >> 10) & 0x3FF;
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int regionX2 = (gstate.region2 & 0x3FF) + 1;
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int regionY2 = ((gstate.region2 >> 10) & 0x3FF) + 1;
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float offsetX = (float)(gstate.offsetx & 0xFFFF) / 16.0f;
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float offsetY = (float)(gstate.offsety & 0xFFFF) / 16.0f;
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if (throughmode) {
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// No viewport transform here. Let's experiment with using region.
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return;
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glViewport((0 + regionX1) * renderWidthFactor, (0 - regionY1) * renderHeightFactor, (regionX2 - regionX1) * renderWidthFactor, (regionY2 - regionY1) * renderHeightFactor);
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} else {
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// These we can turn into a glViewport call, offset by offsetX and offsetY. Math after.
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float vpXa = getFloat24(gstate.viewportx1);
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float vpXb = getFloat24(gstate.viewportx2);
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float vpYa = getFloat24(gstate.viewporty1);
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float vpYb = getFloat24(gstate.viewporty2);
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float vpZa = getFloat24(gstate.viewportz1); // / 65536.0f should map it to OpenGL's 0.0-1.0 Z range
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float vpZb = getFloat24(gstate.viewportz2); // / 65536.0f
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// The viewport transform appears to go like this:
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// Xscreen = -offsetX + vpXb + vpXa * Xview
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// Yscreen = -offsetY + vpYb + vpYa * Yview
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// Zscreen = vpZb + vpZa * Zview
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// This means that to get the analogue glViewport we must:
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float vpX0 = vpXb - offsetX - vpXa;
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float vpY0 = vpYb - offsetY + vpYa; // Need to account for sign of Y
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gstate_c.vpWidth = vpXa * 2;
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gstate_c.vpHeight = -vpYa * 2;
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return;
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float vpWidth = fabsf(gstate_c.vpWidth);
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float vpHeight = fabsf(gstate_c.vpHeight);
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// TODO: These two should feed into glDepthRange somehow.
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float vpZ0 = (vpZb - vpZa) / 65536.0f;
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float vpZ1 = (vpZa * 2) / 65536.0f;
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vpX0 *= renderWidthFactor;
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vpY0 *= renderHeightFactor;
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vpWidth *= renderWidthFactor;
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vpHeight *= renderHeightFactor;
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// Flip vpY0 to match the OpenGL coordinate system.
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vpY0 = renderHeight - (vpY0 + vpHeight);
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glViewport(vpX0, vpY0, vpWidth, vpHeight);
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// Sadly, as glViewport takes integers, we will not be able to support sub pixel offsets this way. But meh.
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// shaderManager_->DirtyUniform(DIRTY_PROJMATRIX);
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}
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}
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