From 796b4b05ec62eb5d58a634854998f485072e8a2b Mon Sep 17 00:00:00 2001
From: chai <chaifix@163.com>
Date: Fri, 29 Oct 2021 15:02:46 +0800
Subject: *passing texture to glsl

---
 Runtime/Graphics/GfxDevice.cpp | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

(limited to 'Runtime/Graphics/GfxDevice.cpp')

diff --git a/Runtime/Graphics/GfxDevice.cpp b/Runtime/Graphics/GfxDevice.cpp
index e4747d8..bd8dd9d 100644
--- a/Runtime/Graphics/GfxDevice.cpp
+++ b/Runtime/Graphics/GfxDevice.cpp
@@ -1,7 +1,11 @@
+#include <vector>
 #include "GfxDevice.h"
 
 static bool deviceInited = false;
 
+static const std::vector<byte> s_AvailableTextureUnitPreset = {0,1,2,3,4,5,6,7}; // 最多支持8个贴图
+static std::vector<byte> s_AvailableTextureUnit = s_AvailableTextureUnitPreset;
+
 GfxDevice g_GfxDevice;
 
 GfxDevice::GfxDevice()
@@ -121,6 +125,26 @@ void GfxDevice::SetUniformMat4(const char* name, Internal::Matrix44 mat4)
     glUniformMatrix4fv(loc, 1, GL_TRUE, &mat4.m[0][0]);
 }
 
+void GfxDevice::SetUniformTexture(const char* name, Texture* texture)
+{
+    if (s_AvailableTextureUnit.size() == 0)
+    {
+        log_error("No available texture unit. Too many textures or forget invoke ResetUniformsState()");
+        return;
+    }
+    int texUnit = s_AvailableTextureUnit.back();
+    s_AvailableTextureUnit.pop_back();
+    glActiveTexture(GL_TEXTURE0 + texUnit);
+    glBindTexture(GL_TEXTURE_2D, texture->GetGpuID());
+    GLint loc = glGetUniformLocation(m_Shader.GetID(), name);
+    glUniform1i(loc, texUnit);
+}
+
+void GfxDevice::ResetUniformsState()
+{
+    s_AvailableTextureUnit = s_AvailableTextureUnitPreset;
+}
+
 void GfxDevice::BeginFrame()
 {
 	m_IsInsideFrame = true;
-- 
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